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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    Source document

    docs/rpo/gmc/sierra-hd-t1xx.md

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    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive Sierra HD — T1XX (2020–2027) page.

    GMC Sierra HD — T1XX (HD) (2020–2027)

    The GMC Sierra HD is the heavy-duty 2500 HD and 3500 HD pickup, all new for the 2020 model year according to GM Authority, and NICB's VIN manuals list its 2500 and 3500 series in every model year from 2020 through 2026. The 2025 to 2027 GM fleet order guides cover three vehicles each year, the 2500 HD Retail and Fleet, the 3500 HD Retail and Fleet pickup and the 3500 HD CC (a chassis cab), with the trim groups 1SA Pro, 3SA SLE, 4SA SLT, 4SB AT4, 4SG AT4X (2500 HD only), 5SA Denali and 5SB Denali Ultimate; the 3500 HD CC guides list only Pro and SLE. Factory lists exist only for 2025 to 2027, so the 2020 to 2024 years rest on GM Authority's model-year pages (engines, transmissions, colors and the codes it names) and on the 2020 Wayback guide capture, which lists the 2500 HD models but no codes. In Notes, S is standard, O is optional and "included in the trim group" means part of that trim group's equipment; "only in" names the vehicles whose lists print the code, and a code printed with more than one meaning has one row per meaning.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    L5P Engine, Duramax 6.6L turbo-diesel V8, B20 diesel compatible 2020–2026 includes engine block heater (K05); 470 hp (350.5 kW) at 2800 rpm and 975 lb-ft (1322 Nm) at 1600 rpm in the 2025 and 2026 guides; GM Authority gives 445 hp and 910 lb-ft for 2020 to 2023 and 470 hp and 975 lb-ft from 2024; 2020 to 2024: GM Authority Sierra HD model-year pages; Denali Ultimate: S; Pro, SLE, SLT, AT4, AT4X, Denali: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    L6P Engine, Duramax turbo-diesel V8, B20 diesel compatible 2027 includes engine block heater (K05); the 2027 guides list this Duramax diesel where the 2025 and 2026 guides list L5P ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    L8S Engine, V8, direct injection, variable valve timing, gasoline 2027 the 2027 guides list this gasoline V8 where the 2025 and 2026 guides list L8T; Pro, SLE, SLT, AT4, AT4X, Denali: S; Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    L8T Engine, 6.6L V8, direct injection, variable valve timing, gasoline 2020–2026 401 hp (299 kW) at 5200 rpm and 464 lb-ft (629 N-m) at 4000 rpm; 2020 to 2024: GM Authority Sierra HD model-year pages ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed

    Transmissions

    Code Description Years Models/Notes Confidence
    MGM Transmission, Allison 10 speed automatic 2020–2027 with the Duramax diesel; the 2026 guides print it without Allison; 2020 to 2024: GM Authority Sierra HD model-year pages pair MGM with the Duramax diesel ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    MGU Transmission, Allison 10 speed automatic with integrated power take-off (PTO) 2020–2027 included with the PTO option; the 2026 guides print it without Allison; 2020 to 2024: GM Authority Sierra HD model-year pages pair MGU with the Duramax diesel; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.94 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.88 confirmed
    MKM Transmission, Allison 10 speed automatic 2024–2027 the 2026 guides print it without Allison; 2024: GM Authority 2024 Sierra HD page lists MKM as the 10 speed automatic with the 6.6L gasoline V8; Pro, SLE, SLT, AT4, AT4X, Denali: S; Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    MYD Transmission, 6 speed automatic 2020–2023 with the 6.6L gasoline V8 (L8T); GM Authority 2020 to 2023 Sierra HD pages list MYD in the powertrain table single-source
    NQF Transfer case, two speed, electronic shift with push button controls 2025–2027 Pro, SLE: included in the trim group, upgradeable; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 confirmed
    NQH Transfer case, two speed, active, electronic Autotrac with push button control 2025–2027 requires 4WD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 confirmed

    Axles

    Code Description Years Models/Notes Confidence
    G80 Differential, rear, auto-locking 2025–2027 Pro, SLE, SLT, AT4, Denali, Denali Ultimate: S; AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    G94 Differential, rear, driver-selectable full-locking, e-locking 2025–2027 only in: 2500 HD; AT4X: S in the 2025 and 2026 guides, included in the trim group in the 2027 guides; the other trims are not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    GT4 Axle, rear, 3.73 ratio 2025–2027 requires the gasoline V8 (L8T; L8S in the 2027 guides); Pro, SLE, SLT, AT4, AT4X, Denali: S; Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    GTY Axle, rear, wide-track 2025–2027 only in: 3500 HD CC; included with the ambulance / fire / rescue package (PCK) ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 confirmed
    GU6 Axle, rear, 3.42 ratio 2024–2027 included with and only available with the Duramax diesel (L5P; L6P in the 2027 guides); 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed

    Packages & Trims

    Code Description Years Models/Notes Confidence
    1SA Trim group, Pro 2020–2022, 2024–2027 all three vehicles; named base Sierra in 2020 and 2021 and Pro from the 2022 model year (GM Authority 2020, 2021 and 2022 Sierra HD pages; the 2021 page names Sierra 1SA); 2024: GM Authority 2024 changes page names Pro 1SA ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    3SA Trim group, SLE 2025–2027 all three vehicles ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    4SA Trim group, SLT 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    4SB Trim group, AT4 2025–2027 only in: 2500 HD and 3500 HD pickup; NICB 2026 lists the AT4 as a 2500 and 3500 4WD series ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    4SG Trim group, AT4X 2025–2027 only in: 2500 HD; NICB 2026 lists the AT4X as a 2500 4WD series only ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    5SA Trim group, Denali 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    5SB Trim group, Denali Ultimate 2025–2027 only in: 2500 HD and 3500 HD pickup; NICB 2025 and 2026 list the Denali Ultimate as 2500 and 3500 4WD series ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    B59 Remote start package 2025–2027 includes remote start (BTV), content theft alarm (UTJ) and rear-window defogger (C49); included in PDU; SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 confirmed
    CWM Technology package 2024–2027 only in: 2500 HD and 3500 HD pickup; includes rear camera mirror (DRZ) and multicolor 15 inch diagonal head-up display (UV6); 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    F60 Heavy duty front spring package 2025–2027 the pickup guides print "Heavy Duty Front Spring/Camper Package"; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O; AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.45 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.43 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.41 confirmed
    NHT Max trailering package 2024–2027 only in: 2500 HD and 3500 HD pickup; 2500 HD: includes 3500 HD frame, leaf springs, 12 inch rear axle and shock package, spray-on bedliner (CGN) and gooseneck / 5th wheel prep (Z6A); 3500 HD pickup: includes F60, Q21 wheels, QHY tires and Z6A, without the bedliner; 2024: GM Authority 2024 changes page (2500 models) ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PCI Convenience package 2025–2027 includes EZ Lift power lock and release tailgate (QT5), tinted glass (AKO), LED cargo bed lighting (UF2), rear-window defogger (C49) and, on Double Cab and Crew Cab, heated vertical trailering mirrors (DBG); the 3500 HD CC lists name only tinted glass, defogger and DBG on Crew Cab; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 confirmed
    PCK Ambulance / fire / rescue package 2025–2027 only in: 3500 HD CC; for a dedicated emergency vehicle (ambulance or fire truck); Regular Cab T*31403 and Fleet or Government orders; provides emissions revisions for emergency vehicles (ANM); includes wide-track rear axle (GTY), Duramax diesel (L5P), diesel particulate filter with manual regeneration (FPF) and engine block heater (K05); Pro, SLE: O ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd cc fleet order guide, p.9 · 2026 gmc sierra 3500 hd cc fleet order guide, p.9 · 2027 gmc sierra 3500 hd cc fleet order guide, p.10 confirmed
    PCQ SLE convenience package 2025–2027 includes dual climate control (CJ2), 10-way power driver seat (A2X), manual tilt and telescoping steering column (N37), LED fog lights (T3U) and roof marker lamps (U01); SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 confirmed
    PCY SLT convenience package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes bucket seats (A50) with center console (D07), ventilated front seats (KQV), two USB ports (UBC), roof marker lamps (U01), wireless charging (K4C) and Bose audio (UQA); SLT: O; Pro, SLE, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 confirmed
    PDB SLT premium package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes PCY, PDY, PED, 6 inch chrome assist steps (BVQ) and spray-on bedliner (CGN); SLT: O; Pro, SLE, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 confirmed
    PDC Texas SLT premium package 2025–2027 only in: 2500 HD and 3500 HD pickup; same content as PDB plus Texas Edition badging; dealers in Arkansas, Louisiana, New Mexico, Oklahoma and Texas only; SLT: O; Pro, SLE, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 confirmed
    PDG AT4 premium plus package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes PDO, power sunroof (CF5), CWM and the AT4 high clearance step (VXW); AT4: O; Pro, SLE, SLT, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 confirmed
    PDH LPO, GMC protection package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes LPO all-weather floor liner (RIA) and front and rear molded splash guards (VQK); dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PDI Sierra HD Pro Safety package 2024–2027 includes forward collision alert (UEU), following distance indicator (UE4), front pedestrian braking (UKJ), IntelliBeam (TQ5), lane departure warning (UFL), buckle to drive (T8Z) and automatic emergency braking (UHY); on every trim; 2024: GM Authority 2024 changes page (standard on all trims); Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    PDJ Driver Alert Package II 2023 not available on Pro; the 2024 Sierra HD Pro Safety package (PDI) replaces it as the standard package (GM Authority 2024 changes page) single-source
    PDL LPO, cargo convenience package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes LPO console-mounted safe (S1O) and rear underseat storage (VBJ); dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PDO AT4 preferred package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes universal home remote (UG1), rear sliding power window (A48) and roof marker lamps (U01); AT4: O; Pro, SLE, SLT, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 confirmed
    PDQ Preferred package 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE; includes in-vehicle trailering app (UET), hitch guidance with Hitch View (PZ8), adaptive cruise control (KSG) and LED cargo bed lighting (UF2), plus UG1 and A48 on Crew Cab and Double Cab; requires PCQ; SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 confirmed
    PDR LPO, assist step and floor liner package 2025–2027 includes LPO all-weather floor liner (RIA) and a choice of 6 inch rectangular (VXH) or 4 inch round (VXJ) chrome tubular assist steps; not with PDH ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PDU SLE value package 2025–2027 only in: 2500 HD and 3500 HD pickup; Crew Cab and Double Cab; includes PCQ, spray-on bedliner (CGN), ZM9 and B59; SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 confirmed
    PDY SLT preferred package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes rear heated seats (KA6), rear sliding power window (A48), universal home remote (UG1) and adaptive cruise control (KSG); SLT: O; Pro, SLE, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 confirmed
    PEC Denali reserve package 2024–2027 only in: 2500 HD and 3500 HD pickup; includes CWM and power sunroof (CF5); 2024: GM Authority 2024 changes page; Denali: O; Pro, SLE, SLT, AT4, AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 confirmed
    PED Sierra HD Pro Safety Plus package 2024–2027 only in: 2500 HD and 3500 HD pickup; includes trailer side blind zone alert (UKV), rear cross traffic alert (UFG) and front and rear park assist (UD5); Crew Cab and Double Cab add bed view camera (UVN), HD surround vision (UV2) and trailer camera provisions (TRG); 2024: GM Authority 2024 changes page; SLE, SLT: O; Pro, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 confirmed
    PQA 1SA Pro Safety Plus package 2024–2027 only in: 2500 HD and 3500 HD pickup; includes front and rear park assist (UD5), rear cross traffic alert (UFG), lane change alert with side blind zone alert (UKC) and trailer mirrors (DWI); 2024: GM Authority 2024 changes page; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 confirmed
    R7O Seat, cloth rear with storage package, 60/40 folding bench 2025–2027 Crew Cab; seatback storage, fold-out armrest with 2 cupholders; included with and only available with PDQ; SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.68 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.64 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.63 confirmed
    RFE LPO, black badging package 2026–2027 only in: 2500 HD and 3500 HD pickup; includes black GMC emblems (SFZ) and black badge (RIK); dealer-installed ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    RFX X31 off-road and protection package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes off-road suspension with twin-tube Rancho shocks (X31), hill descent control (JHD), skid plates (NZZ), spray-on bedliner (CGN), LPO all-weather floor liners (RIA) and X31 badge; SLE, SLT: O; Pro, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.29 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 confirmed
    RGL LPO, Denali illumination package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes LPO illuminated front GMC emblem (RN2), Denali illuminated door sills (S0M) and illuminated puddle lamp emblem (S3I); dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SNO LPO, hitch package, gooseneck ball and chain tiedown kit with case 2025–2027 only in: 2500 HD and 3500 HD pickup; dealer-installed; requires Z6A ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SNR Seat, up-level rear with storage package, 60/40 folding bench 2025–2027 only in: 2500 HD and 3500 HD pickup; Crew Cab; full-length bench, seatback storage, fold-out armrest with 2 cupholders and full cab width under-seat storage ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    ULV AT4X AEV Edition package 2024–2027 only in: 2500 HD; AT4X; includes AEV stamped steel front and rear bumpers (VHU, VQH), gloss black door handles and black tailgate accent, AEV 18 inch wheels (RBJ), spare wheel (QNB), stamped steel skid plates (PZG, PZZ, PZN), AEV embroidered headrests and AEV floor liners (AAO); removes red recovery hooks (UGA) and front license plate kit (VK3); 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 confirmed
    VYU Snow plow prep package 2025–2027 includes 220-amp alternator (KW5), skid plates (NZZ), pass-through dash grommet hole and roof emergency light provisions; requires 4WD; the pickup guides print "Snow Plow Prep/Camper Package"; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.38 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.36 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.36 confirmed
    X31 Package, off-road 2025–2027 only in: 2500 HD and 3500 HD pickup; includes hill descent control (JHD), skid plates (NZZ), off-road suspension with twin-tube Rancho shocks and X31 hard badge (the package carries the X31 badge); requires 4WD; Pro, SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.37 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.35 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.35 confirmed
    Z6A Gooseneck / 5th wheel prep package 2024–2027 only in: 2500 HD and 3500 HD pickup; hitch platform with tray, stamped bed holes with removable caps and bed-mounted 7-pin trailer harness; 2024: GM Authority 2024 changes page; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.33 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.33 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.32 confirmed
    Z82 Trailering package 2025–2027 only in: 2500 HD and 3500 HD pickup; includes trailer hitch, 7-pin and 4-pin connectors and hitch guidance (CTT); Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    Z85 Suspension package 2025–2027 not with X31 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    ZLQ Fleet convenience package 2025–2027 Fleet or Government orders only; includes EZ Lift power lock and release tailgate (QT5) on the pickups; the 3500 HD CC lists name DBG trailering mirrors instead; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 confirmed
    ZM9 SLE heated package 2025–2027 includes heated driver and passenger seats (KA1) and heated steering wheel (KI3); requires PCQ; SLE: O; Pro, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.22 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.21 confirmed

    Equipment

    Code Description Years Models/Notes Confidence
    5H1 Key equipment, two additional key fobs 2025–2027 only in: 2500 HD and 3500 HD pickup; provides two spare key fobs for a total of four; programming is at the customer's expense ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    5JY LPO, soft folding truck bed cover by RealTruck Advantage 2025–2027 only in: 2500 HD and 3500 HD pickup; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    5L5 Theft deterrent system, fleet immobilizer modifications 2025–2027 shortens the roadside key relearn process to three two-minute cycles in place of the standard three ten-minute cycles; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.107 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.97 confirmed
    5N5 Rear camera kit 2025–2027 kit includes camera, fixed bracket and 19 ft cable with clips; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.109 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.105 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 confirmed
    5VI LPO, cargo tie-down rings 2025–2027 only in: 2500 HD and 3500 HD pickup; set of 4, dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    5Y1 Seats, front individual, driver and passenger 2025–2027 derived from the 40/20/40 split bench with the 20% section removed; no floor console and exposed floor area stays untrimmed; removes the USB port and auxiliary power outlet when AZ3 is ordered; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.107 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.97 confirmed
    5Z4 Spare wheel, tire, carrier and lock delete 2025–2027 only in: 2500 HD and 3500 HD pickup; the 2027 lists print "Spare wheel and carrier delete"; jack and tools stay; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 confirmed
    63G LPO, GMC MultiPro tailgate step lights 2025–2027 only in: 2500 HD and 3500 HD pickup; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    8F2 Ornamentation, delete 2025–2027 deletes badges, decals and nameplates for upfitter painting or wrapping; the GMC logo stays; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 confirmed
    8S3 Back-up alarm, 97 decibels 2025–2027 Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.105 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 confirmed
    9B9 Governor, electronic speed sensor set to 70 MPH 2025–2027 limits road speed to 70 MPH and cruise control to 65 MPH; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.100 confirmed
    9C2 Governor, electronic speed sensor set to 65 MPH 2025–2027 limits road speed to 65 MPH and cruise control to 60 MPH; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.100 confirmed
    9D7 Governor, electronic speed sensor set to 75 MPH 2025–2027 limits road speed to 75 MPH and cruise control to 70 MPH; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.100 confirmed
    9F8 GVWR, 12,500 lbs (5670 kg) 2027 only in: 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O ⛭ GM factory document — 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 confirmed
    9J4 Bumper, rear, delete 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    9L3 Spare tire delete 2025–2027 deletes the spare tire and wheel ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    9L7 Upfitter switch kit 2025–2027 provides three 30-amp and two 20-amp configurable circuits; shipped loose; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.31 confirmed
    9M4 Decal and name plate delete, tailgate 2025–2027 only in: 2500 HD and 3500 HD pickup; the GMC emblems stay; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 confirmed
    9N2 GVWR, 10,050 lbs (4559 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    9R1 Decal delete, pickup bed 2025–2027 only in: 2500 HD and 3500 HD pickup; deletes any bed-mounted decals; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 confirmed
    A2S Seat adjuster, driver 4-way manual 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    A2X Seat adjuster, driver 10-way power including lumbar 2025–2027 this code has another meaning in two other A2X rows (the guides print the 10, 12 and 16-way readings); SLT, AT4: S; Pro, SLE: O, requires Jet Black interior trim (H0U) and the convenience package (PCI or ZLQ); AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A2X Seat adjuster, driver 12-way power including lumbar 2025–2027 this code has another meaning in two other A2X rows (the guides print the 10, 12 and 16-way readings); Denali: S; Pro, SLE, SLT, AT4, AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A2X Seat adjuster, driver 16-way power including lumbar and massage 2024–2027 this code has another meaning in two other A2X rows (the guides print the 10, 12 and 16-way readings); AT4X, Denali Ultimate: S; Pro, SLE, SLT, AT4, Denali: not offered; 2024: GM Authority 2024 changes page (16-way power seats with massage, standard on AT4X and Denali Ultimate) ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A45 Driver memory 2025–2027 only in: 2500 HD and 3500 HD pickup; recalls driver presets for the power driver seat and outside mirrors ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    A48 Window, power, rear sliding 2025–2027 only in: 2500 HD and 3500 HD pickup; with rear defogger; SLE, SLT, AT4: O; AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    A50 Seats, front bucket, with center console 2025–2027 AT4, AT4X, Denali, Denali Ultimate: S; SLE, SLT: O; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A60 Tailgate, locking 2025–2027 only in: 2500 HD and 3500 HD pickup; uses the same key as the ignition and doors; Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    A68 Seat, rear 60/40 folding bench 2025–2027 3-passenger, folds up; includes child seat top tether anchor; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    A7E Seat adjuster, passenger 4-way manual 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A7K Seat adjuster, passenger 10-way power including lumbar 2025–2027 this code has another meaning in two other A7K rows (the guides print the 10, 12 and 16-way readings); SLT, AT4: S; Pro, SLE, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A7K Seat adjuster, passenger 12-way power including lumbar 2025–2027 this code has another meaning in two other A7K rows (the guides print the 10, 12 and 16-way readings); Denali: S; Pro, SLE, SLT, AT4, AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    A7K Seat adjuster, passenger 16-way power including lumbar and massage 2024–2027 this code has another meaning in two other A7K rows (the guides print the 10, 12 and 16-way readings); AT4X, Denali Ultimate: S; Pro, SLE, SLT, AT4, Denali: not offered; 2024: GM Authority 2024 changes page (16-way power seats with massage, standard on AT4X and Denali Ultimate) ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    AAK LPO, all-weather floor liners, 1st and 2nd rows 2025–2027 only in: 2500 HD and 3500 HD pickup; includes AT4 logo; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    AAO LPO, AEV brand floor liners 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.62 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.58 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.57 confirmed
    AED Window, power, front, passenger express down 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    AEF Window, power, front, passenger express up and down 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    AEQ Windows, power, rear, express down 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    AKO Glass, deep-tinted 2025–2027 Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 confirmed
    AKP Glass, solar absorbing, tinted 2025–2027 Pro: included in the trim group, upgradeable; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 confirmed
    AQQ Remote keyless entry 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    AU3 Door locks, power 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    AVI Seat belt, adjustable guide loops, front row 2025–2027 only in: 2500 HD and 3500 HD pickup; Crew Cab and Double Cab; not with ZW9; GM Authority lists seat belt adjustable guide loops as added for 2022; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    AVJ Keyless open and start 2025–2027 includes remote keyless entry; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 confirmed
    AXG Windows, power, front, driver express up and down 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    AY0 Airbags, dual-stage frontal for driver and front outboard passenger; seat-mounted side-impact for driver and front outboard passenger; head-curtain for front and rear outboard seating positions; includes front outboard passenger sensing system 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    AZ3 Seats, front 40/20/40 split bench 2025–2027 covered armrest storage and lockable under-seat storage; Pro, SLE: S; SLT: included in the trim group, upgradeable; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 confirmed
    B1J Wheelhouse liners, rear 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    B30 Floor covering, color-keyed carpeting 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    B32 Floor mats, front, rubberized vinyl 2025–2027 SLE: S; Pro: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    B33 Floor mats, rear, rubberized vinyl 2025–2027 SLE: S; Pro: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    B34 Floor mats, front, carpeted 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT, Denali, Denali Ultimate: S; Pro, SLE, AT4, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    B35 Floor mats, rear, carpeted 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT, Denali, Denali Ultimate: S; Pro, SLE, AT4, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    B3L Assist steps, power retractable, black, with LED lighting 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    BG9 Floor covering, rubberized vinyl 2025–2027 Pro: S; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    BHP Winter grille cover 2025–2027 Denali Ultimate: S; Pro, SLE, SLT, AT4, AT4X, Denali: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    BKE Floor liners, premium, with removable carpet insert, rear 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    BKF Floor liners, premium, with removable carpet insert, front 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    BRS Assist steps, power retractable, with LED perimeter lighting and bright accent 2024–2026 only in: 2500 HD and 3500 HD pickup; GMC MultiPro power steps (named so in the Denali reserve package text); 2024: GM Authority 2024 changes page (Denali Ultimate); Denali Ultimate: S; Denali: O; Pro, SLE, SLT, AT4, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    BTM Push button start 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    BTV Remote vehicle starter system 2025–2027 SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 confirmed
    BVQ Assist steps, chrome tubular, 6 inch rectangular, cab length 2025–2027 only in: 2500 HD and 3500 HD pickup; factory installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    BWN CornerStep, rear bumper 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 confirmed
    C3T GVWR, 11,250 lbs (5103 kg) 2027 only in: 3500 HD pickup; Pro: O; SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.73 confirmed
    C49 Defogger, rear window, electric 2025–2027 Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 confirmed
    C59 Air vents, rear 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    C67 Air conditioning, single zone 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    C7A GVWR, lowered, 10,000 lbs (4536 kg) 2025–2027 only in: 2500 HD; lowers the GVWR and significantly decreases towing and payload ratings ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    C7E GVWR, 11,000 lbs (4990 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    C7G GVWR, 10,500 lbs (4763 kg) 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.89 confirmed
    C7L GVWR, 12,000 lbs (5443 kg) 2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    C7N GVWR, 12,300 lbs (5579 kg) 2027 only in: 2500 HD; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O; AT4X: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.86 confirmed
    C7V GVWR, 11,600 lbs (5262 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    C7W GVWR, 11,400 lbs (5171 kg) 2027 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.86 confirmed
    C9V GVWR, 12,700 lbs (5761 kg) 2027 only in: 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O ⛭ GM factory document — 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 confirmed
    CE1 Wipers, front rain-sensing 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page (Rainsense wipers added); SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    CF5 Sunroof, power 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT, AT4, Denali: O; AT4X, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    CGN Bedliner, spray-on 2025–2027 only in: 2500 HD and 3500 HD pickup; pickup bedliner with GMC logo; the tailgate is not sprayed because of its black composite inner panel; Pro, SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 confirmed
    CJ2 Air conditioning, dual-zone automatic climate control 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    CKF GVWR, 11,025 lbs (5001 kg) 2025–2026 only in: 2500 HD; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.94 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.90 confirmed
    CKJ GVWR, 10,950 lbs (4967 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    CKM GVWR, 10,960 lbs (4971 kg) 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.94 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.90 confirmed
    CTT Hitch guidance 2025–2027 only in: 2500 HD and 3500 HD pickup; dynamic single line to aid trailer alignment for hitching; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    D07 Center console, floor-mounted 2025–2027 cup holders, cell phone storage, power cord management and hanging file folder capability; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 confirmed
    D31 Mirror, inside rearview, manual tilt 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    D72 Door handles, black grained 2025–2027 Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 confirmed
    D75 Door handles, body-color 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DBG Mirrors, outside, vertical trailering, power-adjustable with heated upper glass, lower convex mirrors, integrated turn signals, manual folding and extending (extends 3.31 inch [84.25 mm]), black 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DD8 Mirror, inside rearview, auto-dimming 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DLN Mirrors, outside, heated power-adjustable, manual folding 2025–2027 only in: 2500 HD and 3500 HD pickup; smaller non-trailer mirror with flat (not convex) passenger glass; GM Authority lists the code as DLF changing to DLN for 2022; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.29 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 confirmed
    DP6 Mirror caps 2025–2027 only in: 2500 HD and 3500 HD pickup; the 3500 HD lists print "Mirror caps, high gloss Black" ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DP9 Mirror caps, chrome 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DRC Mirror, inside rearview, auto-dimming with partial video display 2025–2027 shows the bed view camera image of the cargo bed; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.63 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.59 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.58 confirmed
    DRZ Rear camera mirror 2024–2027 only in: 2500 HD and 3500 HD pickup; inside rearview, auto-dimming, full camera display; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DUD Mirrors, outside, high-visibility vertical trailering, lower convex mirrors, manual folding and extending (extends 3.31 inch [84.25 mm]), molded in black 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    DWI Mirrors, outside, vertical trailering, power-adjustable with heated and auto-dimming upper glass, lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting (U12), auxiliary lighting, power folding and manual extending (extends 3.31 inch [84.25 mm]), black 2025–2027 the 2027 lists omit the U12 reference; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 confirmed
    DZC Mirrors, outside, vertical trailering, power-adjustable with heated and auto-dimming upper glass (driver and passenger), lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting (U12), auxiliary lighting, power folding and extending (extends 3.31 inch [84.25 mm]) 2025–2027 only in: 2500 HD and 3500 HD pickup; the 2027 lists omit the U12 reference ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    E20 Door handles, chrome 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    E63 Pickup bed 2025–2027 only in: 2500 HD and 3500 HD pickup; includes bed assist step; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    FHS E85 FlexFuel capable 2025–2026 only in: 2500 HD and 3500 HD pickup; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.44 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.42 confirmed
    FPF DPF (diesel particulate filter), manual regeneration 2025–2027 customer regeneration is not allowed until the DPF load reaches 100% and a driver information center message shows ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    G1Y GVWR, 11,500 lbs (5216 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    G3I GVWR, 11,700 lbs (5307 kg) 2025–2026 only in: 3500 HD pickup; single rear wheels on the 3500 HD; Pro, SLE, SLT, AT4, Denali: O; Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.73 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 confirmed
    G4H GVWR, 11,900 lbs (5398 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    G4Y GVWR, 12,100 lbs (5488 kg) 2025–2026 only in: 3500 HD pickup; single rear wheels on the 3500 HD; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.75 confirmed
    G9Y GVWR, 14,000 lbs (6350 kg) 2025–2027 only in: 3500 HD pickup and 3500 HD CC; dual rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    HS1 Safety alert seat 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    IOK Audio system, 13.4 inch diagonal premium GMC Infotainment System with Google built in 2024–2027 color touch-screen, AM/FM stereo, Bluetooth streaming; wireless Android Auto and Apple CarPlay capable; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    IOR Audio system, GMC Infotainment System with 7 inch diagonal color touch-screen 2025–2027 AM/FM stereo, Bluetooth streaming; wireless Apple CarPlay and Android Auto capable; Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    J61 Brakes, 4-wheel antilock, 4-wheel disc, with DURALIFE rotors 2025–2026 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    J64 Brakes, 4-wheel antilock, 4-wheel disc, with DURALIFE rotors 2027 the 2027 lists print "Brakes, 4-wheel antilock"; the 2027 guides list J64 where the 2025 and 2026 guides list J61; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    JBP Brake lining wear indicator 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    JFG GVWR, 10,200 lbs (4627 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFH GVWR, 10,300 lbs (4672 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFJ GVWR, 10,600 lbs (4808 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFK GVWR, 10,700 lbs (4854 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFL GVWR, 10,800 lbs (4899 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFM GVWR, 10,900 lbs (4944 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFN GVWR, 11,100 lbs (5035 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFO GVWR, 11,200 lbs (5080 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JFP GVWR, 11,300 lbs (5126 kg) 2025–2026 only in: 3500 HD pickup; single rear wheels on the 3500 HD; Pro, SLE: O; SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.73 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 confirmed
    JGA GVWR, 10,150 lbs (4604 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGB GVWR, 10,250 lbs (4649 kg) 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.88 confirmed
    JGC GVWR, 10,350 lbs (4695 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGD GVWR, 10,450 lbs (4740 kg) 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.89 confirmed
    JGE GVWR, 10,550 lbs (4785 kg) 2025–2026 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGF GVWR, 10,650 lbs (4831 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGG GVWR, 10,750 lbs (4876 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGH GVWR, 10,850 lbs (4921 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGJ GVWR, 11,050 lbs (5012 kg) 2025–2026 only in: 2500 HD; Pro, SLE, SLT, AT4, Denali: O; AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.95 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.91 confirmed
    JGK GVWR, 11,150 lbs (5058 kg) 2025–2027 only in: 2500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGL GVWR, 11,350 lbs (5148 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGM GVWR, 11,450 lbs (5194 kg) 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.95 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    JGN GVWR, 11,550 lbs (5239 kg) 2025–2026 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGP GVWR, 11,750 lbs (5330 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGQ GVWR, 11,800 lbs (5352 kg) 2025–2026 only in: 3500 HD pickup; single rear wheels on the 3500 HD; Pro, SLE: O; SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.73 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.74 confirmed
    JGR GVWR, 11,850 lbs (5375 kg) 2025–2027 only in: 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGS GVWR, 12,150 lbs (5511 kg) 2025–2027 only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JGT GVWR, 12,250 lbs (5557 kg) 2025–2027 only in: 3500 HD pickup; single rear wheels on the 3500 HD ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    JHD Hill descent control 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 confirmed
    JL1 Trailer brake controller, integrated 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    K05 Engine block heater 2024–2027 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    K1O Air filtration monitoring 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    K34 Cruise control 2025–2026 steering wheel-mounted; Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    K40 Exhaust brake 2024–2027 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    K47 Air filter, heavy-duty 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    K4C Wireless charging 2025–2027 SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    K4Z Battery, auxiliary, 700 cold-cranking amps/70 amp-hr 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali: O; Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.42 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.40 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.40 confirmed
    KA1 Seats, heated, driver and front outboard passenger 2025–2027 SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 confirmed
    KA6 Seats, heated, second row outboard 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 confirmed
    KC4 Cooling, external engine oil cooler 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    KC5 Power outlet, front auxiliary, 12 volt 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    KC9 Power outlet, bed mounted, 120 volt 2025–2027 only in: 2500 HD and 3500 HD pickup; 400 watts shared with KI4; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 confirmed
    KGU Universal vehicle module 2025–2027 module, customer interface harness and instructions; provides vehicle data over an open CAN network (J1939) with 10 switchable inputs and outputs and a configuration tool for upfit equipment ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    KHF Alternators, dual, 220 amps primary, 170 amps auxiliary 2025–2027 with the gasoline V8, the auxiliary battery (K4Z) is required; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.42 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.40 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.40 confirmed
    KI3 Steering wheel, heated 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    KI4 Power outlet, instrument panel, 120 volt 2025–2027 400 watts shared with KC9; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 confirmed
    KNP Cooling, auxiliary external transmission oil cooler 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    KQV Seats, ventilated, driver and front passenger 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 confirmed
    KSG Adaptive cruise control 2024–2027 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    KW5 Alternator, 220 amps 2024–2027 2024: GM Authority 2024 changes page; Denali Ultimate: S; Pro, SLE, SLT, AT4, AT4X, Denali: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    KW7 Alternator, 170 amps 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    N2L Fuel tank, rear only, 40 gallon 2025–2027 only in: 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 confirmed
    N2N Fuel tank, front and rear, 63.5 gallon (240 liters) 2025–2027 only in: 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 confirmed
    N33 Steering column, tilt-wheel, manual, with wheel locking security feature 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    N37 Steering column, tilt-wheel and telescoping, manual 2025–2027 SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    N57 Steering wheel, wrapped 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NK5 Steering wheel, urethane 2025–2027 Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    NP5 Steering wheel, leather-wrapped 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NV8 Steering, digital variable steering assist 2025–2026 only in: 2500 HD and 3500 HD pickup; adjusts steering effort automatically with speed and road conditions; SLT, AT4, AT4X, Denali, Denali Ultimate: S; Pro, SLE: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    NZZ Skid plates, protect the oil pan, front axle and transfer case 2025–2027 Pro, SLE, SLT: O; AT4, Denali, Denali Ultimate: included in the trim group; AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 confirmed
    P03 Wheel trim, painted center caps 2025–2026 only in: 3500 HD pickup and 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    P06 Wheel trim, chrome trim skins and chrome center caps 2025–2026 only in: 3500 HD pickup and 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    P0H OnStar Connect Plus, 12 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.117 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.111 confirmed
    P0I OnStar Connect Plus, 24 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.118 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.112 confirmed
    P0J OnStar Protect, 24 months 2025–2027 the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.115 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 confirmed
    P0K OnStar Protect, 36 months 2025–2027 the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.116 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.111 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.105 confirmed
    P0L OnStar Protect, 48 months 2025–2027 the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.117 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.111 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.105 confirmed
    P0Q OnStar Protect, 60 months 2025–2027 the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.118 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.112 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 confirmed
    P0U OnStar Protect, 12 months 2025–2027 the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.114 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 confirmed
    P0V OnStar Telematics, 12 months 2025–2027 the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.119 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.112 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 confirmed
    P0W OnStar Telematics, 24 months 2025–2027 the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.119 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.113 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.107 confirmed
    P0X OnStar Telematics, 36 months 2025–2027 the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.120 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.113 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.107 confirmed
    P0Y OnStar Telematics, 48 months 2025–2027 the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.120 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.114 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 confirmed
    P0Z OnStar Telematics, 60 months 2025–2027 the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.121 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.114 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 confirmed
    P1N API Pro, 12 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.130 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.124 confirmed
    P1O API Pro, 24 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.131 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.125 confirmed
    P1P API Pro, 36 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.132 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.126 confirmed
    P1Q API Elite, 6 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.133 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.127 confirmed
    P1R API Starter, 6 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.125 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.119 confirmed
    P1S API Starter, 12 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.126 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.120 confirmed
    P1T API Starter, 24 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.127 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.121 confirmed
    P1U API Starter, 36 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.128 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.122 confirmed
    PPW Wireless phone projection, for Apple CarPlay and Android Auto 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PQG OnStar Connect Plus, 36 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.118 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.112 confirmed
    PQH OnStar Connect Plus, 48 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.119 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.113 confirmed
    PQI OnStar Connect Plus, 60 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.119 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.113 confirmed
    PQL OnStar Video Telematics with hardware, 12 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.120 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.114 confirmed
    PQM OnStar Video Telematics with hardware, 24 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.121 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.115 confirmed
    PQP OnStar Video Telematics with hardware, 36 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.122 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.116 confirmed
    PQQ OnStar Video Telematics with hardware, 48 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.123 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.117 confirmed
    PQT OnStar Video Telematics with hardware, 60 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.124 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.118 confirmed
    PR6 SiriusXM, additional 9 months of the SXM Platinum Plan 2025 this code has another meaning from 2026 (see the next PR6 row); the plan extends the trial period included with the vehicle ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PR6 API Elite, 24 months 2026–2027 the 2025 lists use this code for the SiriusXM plan above; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.135 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.129 confirmed
    PR7 SiriusXM, additional 21 months of the SXM Platinum Plan 2025 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.124 confirmed
    PR8 SiriusXM, additional 33 months of the SXM Platinum Plan 2025 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.124 confirmed
    PRB OnStar One, 3 years 2025–2027 the 2027 lists print "3 Years OnStar One (Standalone)"; requires order type TRE or SRE ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PRE API Elite, 12 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.134 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.128 confirmed
    PTO Power take-off 2025–2027 requires the Duramax diesel and a 4WD model; includes the MGU transmission; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.46 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.44 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.41 confirmed
    PTT Trailer tire pressure monitor sensors 2025–2027 only in: 2500 HD and 3500 HD pickup; set of 4; requires the in-vehicle trailering app (UET); SLE, SLT, AT4, Denali: O; AT4X, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 confirmed
    PXD Wheels, 18" (45.7 cm), machined aluminum with dark grey metallic accents 2021, 2025–2027 only in: 2500 HD and 3500 HD pickup; GM Authority lists it as added for 2021; 2021: GM Authority 2021 Sierra HD page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PYN Wheels, 17" (43.2 cm), painted steel, silver 2025–2026 only in: 2500 HD; Pro: S; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    PYQ Wheels, 17" (43.2 cm), machined aluminum 2025–2026 only in: 2500 HD; SLE: S; Pro: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    PYT Wheels, 18" (45.7 cm), 8-spoke painted steel, silver 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    PYW Wheels, 17" (43.2 cm), painted steel 2025–2026 only in: 3500 HD pickup and 3500 HD CC; Pro, SLE: S; SLT: included in the trim group, upgradeable; AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.8 confirmed
    PZ8 Hitch guidance with Hitch View 2025–2027 only in: 2500 HD and 3500 HD pickup; with image adjustment and pan, zoom and tilt; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 confirmed
    PZG Skid plates, front approach, stamped steel 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.97 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.87 confirmed
    PZN Skid plates, transfer case, stamped steel 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.97 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.87 confirmed
    PZZ Skid plates, steering gear, stamped steel 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.97 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.87 confirmed
    Q21 Wheels, 18" (45.7 cm), polished forged aluminum 2024–2027 only in: 3500 HD pickup and 3500 HD CC; the 2027 guides add a chrome center cap; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    Q7F Wheels, 20" (50.8 cm), ultra-bright machined, bright chrome inserts, black painted pockets 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    Q7H Wheels, 20" (50.8 cm), ultra-bright machined aluminum, gloss black inserts, black painted pockets 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    Q7J Wheels, 20" (50.8 cm), bright face, dark painted pockets 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE, SLT: O; Pro, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.35 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.33 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.33 confirmed
    Q7N Wheels, 20" (50.8 cm), high gloss black aluminum, 8 spokes 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    Q7Q Wheels, 20", Transit aluminum, for LPO 20" wheels and tires 2025–2027 only in: 2500 HD and 3500 HD pickup; AT4, Denali, Denali Ultimate: O; Pro, SLE, SLT, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.83 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.79 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.77 confirmed
    QF6 Tires, LT275/70R18E, all-terrain, blackwall 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    QF9 Tires, LT275/65R20, all-terrain, blackwall 2025–2027 only in: 2500 HD and 3500 HD pickup; AT4, Denali, Denali Ultimate: S; SLE, SLT: O; Pro, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    QFG Tires, LT275/65R20 E 126/123, BF Goodrich off-road T/A KO3 2025–2027 only in: 2500 HD and 3500 HD pickup; AT4: O; Pro, SLE, SLT, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.34 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 confirmed
    QG3 Tires, LT275/70R18, mud-terrain, blackwall 2021 2500 HD only, not available on the 3500 HD; GM Authority 2021 Sierra HD page lists it as added for 2021; the 2025 2500 HD guide change log (p.161) names QG3 in a deleted trailering note; no body-builder manual pass yet ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.161 single-source
    QHQ Tires, LT245/75R17E, all-season, blackwall 2025–2026 only in: 2500 HD; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    QHY Tires, LT235/80R18, all-terrain, blackwall 2025–2027 only in: 3500 HD pickup and 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    QK1 Tailgate, standard 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    QK2 Tailgate, GMC MultiPro 2025–2027 only in: 2500 HD and 3500 HD pickup; six functional load and access features ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    QMG Tires, LT305/70R18-126/123R, 35 inch M/T 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    QNB Wheel, spare, 18" (45.7 cm) 2024–2027 only in: 2500 HD; AEV Edition; GM prints the metric size as 50.8 cm (that is 20 inches); the ULV package text gives 18 x 9; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.80 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.76 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.74 confirmed
    QNN Wheel, spare, 18" (45.7 cm) 2025–2026 only in: 2500 HD; GM prints the metric size as 50.8 cm (that is 20 inches); AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    QNZ Tire, spare, LT305/70R18-126/123R, 35 inch M/T 2025–2027 only in: 2500 HD; AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 confirmed
    QOU Wheel, spare, 18" (45.7 cm) 2027 only in: 2500 HD; GM prints the metric size as 50.8 cm (that is 20 inches); AT4X: included in the trim group, upgradeable; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    QT2 Tailgate, gate function manual 2025–2027 only in: 2500 HD and 3500 HD pickup; no lift assist; Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    QT5 Tailgate, gate function manual with EZ Lift, includes power lock and release 2025–2027 only in: 2500 HD and 3500 HD pickup; includes hitch area light; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S; Pro: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    QWF Tires, LT265/70R18E, all-terrain, blackwall 2027 only in: 2500 HD; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    QXT Tires, LT265/70R17E, all-terrain, blackwall 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.34 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 confirmed
    QZT Tires, LT235/80R17E, all-terrain, blackwall 2025–2026 only in: 3500 HD pickup and 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    R5K Wheels, 18" (45.7 cm), painted steel, silver 2025, 2027 only in: 3500 HD pickup and 3500 HD CC; the 2025 list prints "Wheels 18" painted steel"; the 2027 guides add a painted center cap ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    R6P SiriusXM, 3 years 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 confirmed
    R7Z API Pro, 6 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.129 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.123 confirmed
    R8G OnStar One Fleet, 12 months 2025–2027 the 2025 lists name it OnStar One Business Plus; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.121 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.115 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.109 confirmed
    R8P OnStar One Fleet, 36 months 2025–2027 the 2025 lists name it OnStar One Business Plus; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.122 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.116 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 confirmed
    R8W OnStar One Fleet, 60 months 2025–2027 the 2025 lists name it OnStar One Business Plus; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.123 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.117 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.111 confirmed
    R8Z OnStar One Fleet, 48 months 2025–2027 the 2025 lists name it OnStar One Business Plus; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.123 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.116 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.110 confirmed
    R9L OnStar Basics, deleted (OnStar Fleet Basics for Fleet) 2025–2027 this code has another meaning in a second guide entry (see the next R9L row); the 2025 guides print "Deleted OnStar Basics", the 2026 and 2027 guides print "Removes OnStar Basics"; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.64 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.60 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.59 confirmed
    R9L OnStar Premium Plan, 3 years, deleted 2025 this code has another meaning in a second guide entry (the first is OnStar Basics); the 2025 guides print "Deleted 3 Years of OnStar Premium Plan"; the 2026 and 2027 guides do not print this entry; Denali Ultimate: O; Pro, SLE, SLT, AT4, AT4X, Denali: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.23 confirmed
    R9M OnStar One, 3 years 2024–2027 only in: 2500 HD and 3500 HD pickup; the 2025 lists print "3 Years of OnStar Premium Plan"; GM Authority lists R9M as the 3 year OnStar Premium Plan on the 2024 AT4X and Denali Ultimate; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    R9V Mobile Service Plus, 3 years 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.64 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 confirmed
    R9W Mobile Service Plus, deleted 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.28 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 confirmed
    R9Y Mobile Service Plus, 1 year 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.25 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 confirmed
    RB1 Wheels, 18" (45.7 cm) 2027 only in: 2500 HD; AT4X: included in the trim group, upgradeable; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    RBJ Wheels, 18" (45.7 cm), AEV black gloss aluminum with laser etching and AEV branded center cap 2024–2027 only in: 2500 HD; AEV Edition; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.80 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.75 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.74 confirmed
    RCS Wheels, 18" (45.7 cm), machined aluminum with high gloss black accents 2024–2026 only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    RFH OnStar One Fleet, 24 months 2025–2027 the 2025 lists name it OnStar One Business Plus; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.122 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.115 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.109 confirmed
    RFS API Elite, 36 months 2026–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.136 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.130 confirmed
    RIA LPO, all-weather floor liner 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    RIK LPO, black Sierra nameplates 2026–2027 only in: 2500 HD and 3500 HD pickup; called the black badge in the black badging package text; dealer-installed ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    RN2 LPO, illuminated front GMC emblem 2025–2027 only in: 2500 HD and 3500 HD pickup; red; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    RN6 Wheels, 22", Transit steel, painted black 2025–2027 only in: 2500 HD; AT4, Denali, Denali Ultimate: O; Pro, SLE, SLT, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.40 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.39 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.77 confirmed
    RSR Rear seat reminder 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    RTJ Wheels, 20" (50.8 cm), high gloss black painted aluminum 2021, 2025–2027 only in: 3500 HD pickup; 2021: GM Authority 2021 Sierra HD page lists it as added for 2021 ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.112 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.122 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.109 confirmed
    RVQ LPO, black tubular assist steps, 6 inch rectangular 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    RVS LPO, black tubular assist steps, 4 inch round 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    S0M LPO, Denali illuminated door sills 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    S1O LPO, console-mounted safe 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    S3I LPO, GMC illuminated puddle lamp emblem 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    S41 LPO, rear wheelhouse liners 2025–2027 only in: 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    S6L LPO, sport step, black 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SAF Tire carrier lock 2025–2026 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    SAK LPO, 22" (55.9 cm) high gloss black aluminum wheels with machined accents 2024–2027 only in: 2500 HD; the factory ships the truck with 22 inch Transit wheels at alignment specs for the LPO wheels; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SAX LPO, MultiPro tailgate audio system by Kicker 2025–2027 only in: 2500 HD and 3500 HD pickup; AT4X, Denali Ultimate: S; SLE, SLT, AT4, Denali: O; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    SAY LPO, 22" (55.9 cm) bright finish aluminum wheels 2025–2027 only in: 2500 HD; the factory ships the truck with 22 inch Transit wheels at alignment specs for the LPO wheels ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SBL LPO, 22" (55.9 cm) gloss black aluminum wheels 2024–2027 only in: 2500 HD; 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SBZ LPO, sport pedal cover kit 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SF6 LPO, body color wheel arch moldings 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SFE LPO, wheel locks 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.34 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.32 confirmed
    SFZ LPO, black GMC emblems 2026–2027 only in: 2500 HD and 3500 HD pickup; the pickup 2500 HD lists print "front"; dealer-installed ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SHH LPO, 20" (50.8 cm) high gloss black painted wheels 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SKX LPO, 20" (50.8 cm) high gloss black aluminum wheels with machined accents 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SPZ LPO, black lug nut and wheel lock kit 2026–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SQ9 LPO, 20" (50.8 cm) machined aluminum wheels with high gloss black accents 2022, 2025–2027 only in: 2500 HD and 3500 HD pickup; GM Authority lists it as added for 2022 (beadlock appearance); 2022: GM Authority 2022 Sierra HD page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    T3U Fog lamps, LED 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    T4L Headlamps, animated LED projectors, LED turn signals and daytime running lamps 2024–2027 2024: GM Authority 2024 changes page (animated LED headlamps, standard on all trims); Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    T8Z Buckle to drive 2024–2027 2024: GM Authority 2024 changes page; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    TDM Teen driver 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    TGH Assist handle, side, bed mounted, fold-out grab handle 2026–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.28 confirmed
    TQ5 IntelliBeam 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    TRG Trailer camera provisions and trailer viewing software 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 confirmed
    TRO LPO, auxiliary trailer camera, wired 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    U01 Lamps, roof marker, smoked amber, LED 2025–2027 not available with the California emissions requirements (YF5) on single rear wheels ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    U2K SiriusXM, trial subscription 2025–2027 Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.26 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.23 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.24 confirmed
    U95 Audio system feature, 2 speakers 2025–2027 Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    UBC USB ports, 2, charge/data, inside the center console 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 confirmed
    UBD USB ports, 2 (first row), on the console 2025–2027 only in: 2500 HD and 3500 HD pickup; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro, SLE, SLT: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 confirmed
    UBI USB ports, 2, charge only, rear 2025–2027 Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 confirmed
    UBJ USB ports, 2, charge/data, on the instrument panel 2025–2027 the 3500 HD CC lists print "USB ports, 2" ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    UD5 Front and rear park assist, ultrasonic 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    UDC Driver information center, 3.5" diagonal monochromatic display 2025–2027 Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    UDV Driver information center, enhanced, 12.3" diagonal reconfigurable multicolor digital display 2024–2027 2024: GM Authority 2024 changes page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    UE1 OnStar services capable 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    UE4 Following distance indicator 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    UET In-vehicle trailering app 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.20 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 confirmed
    UEU Forward collision alert 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    UF2 LED cargo area lighting 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 confirmed
    UF3 High idle switch 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.45 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.43 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.41 confirmed
    UFG Rear cross traffic alert 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    UFL Lane departure warning 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    UG1 Universal home remote 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE, SLT, AT4: O; AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    UGA Recovery hooks, red 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page; AT4, AT4X: S; Pro, SLE, SLT, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    UH5 Rear seat belt indicator 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 confirmed
    UHY Automatic emergency braking 2025–2027 only in: 2500 HD and 3500 HD pickup; the 3500 HD CC lists print "Low Speed Forward Automatic Braking" for this code (Pro, SLE: included in the trim group); part of the Sierra HD Pro Safety package (PDI); Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 · 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd cc fleet order guide, p.5 · 2026 gmc sierra 3500 hd cc fleet order guide, p.5 · 2027 gmc sierra 3500 hd cc fleet order guide, p.5 confirmed
    UJM Tire pressure monitoring system 2025–2027 only in: 3500 HD CC; Pro, SLE: S ⛭ GM factory document — 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd cc fleet order guide, p.3 · 2026 gmc sierra 3500 hd cc fleet order guide, p.3 · 2027 gmc sierra 3500 hd cc fleet order guide, p.2 confirmed
    UJN Tire pressure monitoring system, auto learn, includes tire fill alert 2025–2027 only in: 2500 HD and 3500 HD pickup; does not apply to the spare tire; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    UK3 Steering wheel audio controls 2025–2027 SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 confirmed
    UKC Lane change alert with side blind zone alert 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.58 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.54 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.53 confirmed
    UKJ Front pedestrian braking 2024–2026 2024: GM Authority 2024 changes page; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 confirmed
    UKT Front pedestrian and bicyclist braking 2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.10 confirmed
    UKV Trailer side blind zone alert 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    UQA Bose sound system, premium 7-speaker, with Richbass woofer 2025–2027 only in: 2500 HD and 3500 HD pickup; SLT: O; AT4, Denali: included in the trim group; Pro, SLE, AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    UQF Audio system feature, 6-speaker system 2025–2027 Pro, SLE: S; SLT: included in the trim group, upgradeable; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.1 confirmed
    UQS Bose Premium Series with 12-speaker system 2024–2027 only in: 2500 HD and 3500 HD pickup; with CenterPoint, Richbass woofer and AudioPilot; 2024: GM Authority 2024 changes page; AT4X, Denali Ultimate: included in the trim group; Pro, SLE, SLT, AT4, Denali: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.13 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 confirmed
    URD GMC premium information display, 13.4" diagonal multicolor touch screen 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    UTJ Theft-deterrent system, unauthorized entry (content theft alarm) 2025–2027 SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 confirmed
    UV2 HD surround vision 2025–2027 only in: 2500 HD and 3500 HD pickup; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.14 confirmed
    UV6 Head-up display, multicolor, 15" diagonal 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    UVB HD rear vision camera 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 confirmed
    UVN Bed view camera, camera in the CHMSL, display in the infotainment screen 2025–2027 only in: 2500 HD and 3500 HD pickup; includes two trailer camera provisions; SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.15 confirmed
    UVO Bed view camera, camera in the CHMSL, display in the rearview mirror 2025–2027 Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.27 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.28 confirmed
    UY2 Trailering wiring provisions 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.39 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.37 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.36 confirmed
    V46 Bumper, front, chrome lower 2025–2027 Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 confirmed
    V76 Recovery hooks, front, frame-mounted, black 2025–2027 Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    VB5 Bumper, front, body-color lower 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VBJ LPO, rear underseat storage, composite storage bin 2025–2027 Crew Cab includes a lockable lid; requires Crew Cab or Double Cab; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VHU Bumper, front, AEV stamped steel, high approach with integrated heavy duty cast recovery points (winch capable) 2024–2027 only in: 2500 HD; AEV Edition; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.74 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.69 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.68 confirmed
    VJH Bumper, rear, chrome, with CornerSteps 2025–2027 only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.5 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.4 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 confirmed
    VK3 License plate kit, front 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.31 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.28 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.29 confirmed
    VLQ Recovery hooks, front, chrome 2024–2027 only in: 2500 HD and 3500 HD pickup; 2024: GM Authority 2024 changes page; Denali, Denali Ultimate: S; SLT: O; Pro, SLE, AT4, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.8 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.6 confirmed
    VOZ LPO, hard folding truck bed cover by RealTruck Advantage 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VQH Bumper, rear, AEV stamped steel with heavy-duty cast integrated recovery points 2024–2027 only in: 2500 HD; AEV Edition; 2024: GM Authority 2024 changes page; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.74 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.69 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.68 confirmed
    VQK LPO, front and rear black molded splash guards 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VQO LPO, black assist steps 2025–2027 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VQZ LPO, polished exhaust tip 2025–2027 only in: 2500 HD and 3500 HD pickup; Denali: included in the trim group; Pro, SLE, SLT, AT4, AT4X, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.19 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.18 confirmed
    VT5 Bumper, rear, body-color, with CornerSteps 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VV4 Wi-Fi hotspot capable 2025–2027 Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.3 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.2 confirmed
    VXH LPO, assist steps, chrome tubular 2025–2027 6 inch rectangular (named in the assist step and floor liner package text) ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VXJ LPO, assist steps, chrome tubular 2025–2027 4 inch round (named in the assist step and floor liner package text) ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VXW LPO, off-road high clearance steps 2025–2027 only in: 2500 HD and 3500 HD pickup; called the AT4 high clearance step in the AT4 premium plus package text; dealer-installed ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    XGD Tires, LT265/60R22 E, all-terrain, blackwall 2025–2027 only in: 2500 HD; AT4, Denali, Denali Ultimate: O; Pro, SLE, SLT, AT4X: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.34 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.73 confirmed
    ZAE Tire, spare 2025–2027 only in: 3500 HD pickup and 3500 HD CC; Pro, SLE, SLT: O; Denali, Denali Ultimate: included in the trim group, upgradeable; AT4: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.17 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.16 · 2027 gmc sierra 3500 hd retail and fleet fleet order guide, p.16 confirmed
    ZHQ Tire, spare, LT245/75R17E, all-season, blackwall 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.35 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 confirmed
    ZRX Suspension, off-road, with 1.5 inch lift 2024–2027 only in: 2500 HD; AT4X; front lift with control arms, ball joints, knuckles and DSSV dampers, rear lift with spacer block, DSSV dampers, half shafts and 3-stage leaf springs from the 3500; 2024: GM Authority 2024 changes page (factory-installed 1.5 inch lift); AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.12 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.11 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.9 confirmed
    ZW9 Pickup bed, delete 2025–2027 only in: 2500 HD and 3500 HD pickup; the 3500 HD CC lists print "Body, Chassis Cab" for this code (Pro, SLE: S); includes capped fuel fill, back-up alarm calibration (SFW), rear bumper delete (9J4), spare tire delete (9L3) and spare tire carrier delete; deletes the tire carrier lock (SAF), standard tailgate (QK1) and locking tailgate (A60); requires a long bed model and 17 inch wheels on the 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.30 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.31 · 2025 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2027 gmc sierra 3500 hd cc fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd cc fleet order guide, p.3 · 2026 gmc sierra 3500 hd cc fleet order guide, p.3 · 2027 gmc sierra 3500 hd cc fleet order guide, p.3 confirmed
    ZWF Tire, spare, LT265/70R18E, all-season, blackwall 2027 only in: 2500 HD; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.7 confirmed
    ZXT Tire, spare, LT265/70R17E, all-terrain, blackwall 2025–2026 only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.35 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.32 confirmed
    ZYG Tire, spare, LT275/70R18, all-terrain, blackwall 2025–2027 only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    ZZT Tire, spare, LT235/80R17E, all-terrain 2025–2026 only in: 3500 HD pickup and 3500 HD CC; Pro, SLE, SLT: O; AT4, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 3500 hd retail and fleet fleet order guide, p.29 · 2026 gmc sierra 3500 hd retail and fleet fleet order guide, p.29 confirmed

    Paint

    Code Description Years Models/Notes Confidence
    01U Paint, special exterior color 2025–2027 Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.108 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 confirmed
    5IS Paint, Silver Ice Metallic 2025–2027 SEO paint; GM requires 5 orders before sending it to the plant and it may need extended lead time; touch-up WA-636R ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.96 confirmed
    9V5 Paint, Woodland Green 2025–2027 SEO paint; may need extended lead time; touch-up WA-9015 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.96 confirmed
    9W3 Paint, Wheatland Yellow 2025–2027 SEO paint; may need extended lead time; touch-up WA-253A ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.96 confirmed
    9W4 Paint, Tangier Orange 2025–2027 SEO paint; may need extended lead time; touch-up WA-9417 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.106 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.96 confirmed
    G1W Paint, White Frost Tricoat 2025 touch-up WA-140X ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 confirmed
    G42 Paint, Coastal Dune 2026–2027 new for 2026; touch-up WA-234L ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    G48 Paint, Redwood Metallic 2024 not available on Pro 1SA, AT4, AT4X or Denali; GM Authority 2024 changes page lists it among the seven new 2024 colors single-source
    G4J Paint, Glacier White Tricoat 2026–2027 touch-up WA-241L ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.100 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.94 confirmed
    G6M Paint, Titanium Rush Metallic 2024–2027 2024: GM Authority 2024 changes page; touch-up WA-618G ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    G7C Paint, Cardinal Red 2025–2027 touch-up WA-130X ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    GAZ Paint, Summit White 2025–2027 touch-up WA-8624 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    GBA Paint, Onyx Black 2025–2027 touch-up WA-8555 ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    GNO Paint, Thunderstorm Gray 2024–2025 printed GNO; GM's other lists print GN0 for a different part (rear leaf suspension); the 2026 guide change log removes it from the 4SA to 5SB color and trim pages; 2024: GM Authority 2024 changes page; touch-up WA-633D ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 confirmed
    GNT Paint, Volcanic Red Tintcoat 2024–2027 2024: GM Authority 2024 changes page; touch-up WA-170H ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.104 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.100 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.94 confirmed
    GXD Paint, Sterling Metallic 2024–2027 2024: GM Authority 2024 changes page; touch-up WA-130H ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    GXP Paint, Downpour Metallic 2024–2027 2024: GM Authority 2024 changes page; touch-up WA-136H ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed

    Interior Trim

    Code Description Years Models/Notes Confidence
    H0U Interior trim, Jet Black, cloth seating surfaces 2025–2027 Pro (1SA) and SLE (3SA); bench seat AZ3, and bucket seats A50 on SLE; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    H1T Interior trim, Jet Black, cloth seating surfaces 2025–2027 Pro (1SA); bench seat AZ3; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    H1Y Interior trim, Jet Black, perforated leather-appointed seating surfaces 2025–2027 SLT (4SA); bench seat AZ3 or bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    H24 Interior trim, Atmosphere/Brownstone, Forge perforated leather seating surfaces 2025–2027 Denali (5SA); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    H2G Interior trim, Jet Black, vinyl seating surfaces 2025–2027 Pro (1SA); bench seat AZ3; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    H2X Interior trim, Jet Black, Forge perforated leather seating surfaces 2025–2027 Denali (5SA); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    H40 Interior trim, Alpine Umber, full grain leather seats 2024–2027 Denali Ultimate (5SB); bucket seats A50; 2024: GM Authority 2024 changes page; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    H9J Interior trim, Obsidian Rush, full grain leather seats 2025–2027 AT4X (4SG, 2500 HD only); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    HV5 Interior trim, Dark Walnut/Slate, cloth seating surfaces 2025–2027 SLE (3SA); bench seat AZ3 or bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92 confirmed
    HVD Interior trim, Jet Black with Kalahari accents, perforated leather seating surfaces 2025–2027 AT4 (4SB); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed
    HVE Interior trim, Dark Walnut/Slate, perforated leather-appointed seating surfaces 2025–2027 SLT (4SA); bench seat AZ3 or bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93 confirmed

    Internal / Process

    Code Description Years Models/Notes Confidence
    5M7 Speedometer calibration 2025–2027 internal code the 2500 HD and 3500 HD pickup lists print "Speedometer calibration, provisions" ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    8X8 Label, fasten seat belts 2025–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    FE9 Emissions, federal requirements 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NB8 Emissions override, California 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NB9 Emissions override, state-specific 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NC7 Emissions override, federal 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    NE1 Emissions, state requirements 2025–2027 internal code the 2025 lists name Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia and Washington; the 2026 and 2027 lists print only "Emissions" ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SFW Back-up alarm calibration 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    SQE Ship thru, for orders with (CGN) spray-on bedliner, produced in Flint Assembly and shipped to GFX for (CGN) spray-on bedliner then to Adrian Steel, Toledo, OH, returned to Flint Assembly for shipping to final destination 2025–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TBL Ship thru, produced in Flint Assembly and shipped to Creech Ladders and Racks, Nashville TN, returned to Wentzville Assembly for shipping to final destination 2025–2026 internal code only in: 2500 HD and 3500 HD CC ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TCE Ship thru, for orders with (CGN) spray-on bedliner, produced in Flint Assembly and shipped to Auto Truck Group, Roanoke, IN and returned to Ft. Wayne Assembly for shipping to final destination 2026–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TCH Ship thru, for orders with (CGN) spray-on bedliner, produced in Flint Assembly and shipped to Reading Truck Equipment, Pontiac, MI and returned to Flint Assembly for shipping to final destination 2025–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TCL Ship thru, produced in Flint Assembly and shipped to Kerr Industries, Warren, MI, returned to Flint Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TDE Ship thru, produced in Flint Assembly and shipped to Monroe Truck Equipment, MI, then to TK Services, AK for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TVY Ship thru, produced and shipped to Anchorage VDC then to TK Services and returned to Anchorage VDC for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    TZS Ship thru, produced in Flint Assembly and shipped to Alt. Fuel Innovations LLC, Kansas City, MO, returned to Fairfax Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VCB Ship thru, produced in Flint Assembly and shipped to Monroe Truck Equipment in Flint, returned to Flint Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VDK Ship thru, produced in Flint Assembly and shipped to Royal Truck Body, Flint, MI, returned to Flint Assembly for shipping to final destination 2027 internal code only in: 2500 HD and 3500 HD CC ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VDR Ship thru, produced in Flint Assembly and shipped to Push-N-Pull, Pittsburgh, PA, returned to Flint Assembly for shipping to final destination 2026–2027 internal code ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VEW Ship thru, produced in Flint Assembly and shipped to Canfield Equipment in Warren, MI, returned to Lansing Delta for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VFW Ship thru, produced in Flint Assembly and shipped to NBC Truck Equipment Roseville, MI, returned to Flint Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VHR Ship thru, produced in Flint Assembly and shipped to Reading Equipment and Distribution Pontiac, MI, returned to Lansing Delta for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VSX Trailering information label 2025–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VTV Ship thru, for orders with (CGN) spray-on bedliner, produced in Flint Assembly and shipped to Knapheide Truck Equipment, Flint, MI and returned to Lansing Delta for shipping to final destination 2026–2027 internal code only in: 2500 HD and 3500 HD pickup ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VUD Ship thru, produced in Flint Assembly and shipped to Knapheide Truck Equipment in Flint, MI, returned to Flint Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    VUI Ship thru, produced in Flint Assembly and shipped to Auto Truck Group, Roanoke, IN and returned to Ft. Wayne Assembly for shipping to final destination 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed
    YF5 Emissions, California state requirements 2025–2027 internal code ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 · 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1 confirmed

    Sources

    Factory documents (T1)

    • gmc/2025-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2025 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2025-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide.txt — 2025 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2025-gmc-sierra-3500-hd-cc-fleet-order-guide-rpo-codes.txt — 2025 GMC Sierra 3500 HD CC — GM Fleet Order Guide, RPO Codes
    • gmc/2025-gmc-sierra-3500-hd-cc-fleet-order-guide.txt — 2025 GMC Sierra 3500 HD CC — GM Fleet Order Guide (Print All)
    • gmc/2025-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2025 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2025-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide.txt — 2025 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2026-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2026 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2026-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide.txt — 2026 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2026-gmc-sierra-3500-hd-cc-fleet-order-guide-rpo-codes.txt — 2026 GMC Sierra 3500 HD CC — GM Fleet Order Guide, RPO Codes
    • gmc/2026-gmc-sierra-3500-hd-cc-fleet-order-guide.txt — 2026 GMC Sierra 3500 HD CC — GM Fleet Order Guide (Print All)
    • gmc/2026-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2026 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2026-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide.txt — 2026 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2027-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2027 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2027-gmc-sierra-2500-hd-retail-and-fleet-fleet-order-guide.txt — 2027 GMC Sierra 2500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2027-gmc-sierra-3500-hd-cc-fleet-order-guide-rpo-codes.txt — 2027 GMC Sierra 3500 HD CC — GM Fleet Order Guide, RPO Codes
    • gmc/2027-gmc-sierra-3500-hd-cc-fleet-order-guide.txt — 2027 GMC Sierra 3500 HD CC — GM Fleet Order Guide (Print All)
    • gmc/2027-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide-rpo-codes.txt — 2027 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide, RPO Codes
    • gmc/2027-gmc-sierra-3500-hd-retail-and-fleet-fleet-order-guide.txt — 2027 GMC Sierra 3500 HD Retail and Fleet — GM Fleet Order Guide (Print All)
    • gmc/2020-gmc-all-new-sierra-denali-2500-hd-fleet-order-guide-wayback.txt — 2020 GMC All New Sierra Denali 2500 HD — GM Fleet Order Guide (Wayback Machine captures); a thin capture, page 1 lists the 2500 HD models (TC20743 through TK20903) and the guide sections but no codes

    Other sources