GMC · 2020-2027
Sierra HD — T1XX (2020–2027)
sierra hd · sierra 2500hd · sierra 3500hd · sierra 2500 hd · sierra 3500 hd · sierra hd pro · sierra hd sle · sierra hd slt
476 option rows 476 RPO codes 8 model years
99% Factory-verified
- ✓ Factory-verified · 472
- ● Confirmed · 0
- ◑ Single-source · 4
- ⚠ Disputed · 0
Applicable options
Documented RPO codes
Model year
| Code | Option | Years | Notes & factory source | Confidence |
|---|---|---|---|---|
| Engines | ||||
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| Transmissions | ||||
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| Axles | ||||
| G80 | Differential, rear, auto-locking | 2025–2027 | Pro, SLE, SLT, AT4, Denali, Denali Ultimate: S; AT4X: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| GTY | Axle, rear, wide-track | 2025–2027 | only in: 3500 HD CC; included with the ambulance / fire / rescue package (PCK) | Factory-verified |
| 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 | Factory-verified |
| Packages & Trims | ||||
| 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 | Factory-verified |
| 3SA | Trim group, SLE | 2025–2027 | all three vehicles | Factory-verified |
| 4SA | Trim group, SLT | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 4SG | Trim group, AT4X | 2025–2027 | only in: 2500 HD; NICB 2026 lists the AT4X as a 2500 4WD series only | Factory-verified |
| 5SA | Trim group, Denali | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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) | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| Z85 | Suspension package | 2025–2027 | not with X31 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| Equipment | ||||
| 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 | Factory-verified |
| 5JY | LPO, soft folding truck bed cover by RealTruck Advantage | 2025–2027 | only in: 2500 HD and 3500 HD pickup; dealer-installed | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 5VI | LPO, cargo tie-down rings | 2025–2027 | only in: 2500 HD and 3500 HD pickup; set of 4, dealer-installed | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 63G | LPO, GMC MultiPro tailgate step lights | 2025–2027 | only in: 2500 HD and 3500 HD pickup; dealer-installed | Factory-verified |
| 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 | Factory-verified |
| 8S3 | Back-up alarm, 97 decibels | 2025–2027 | Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 9F8 | GVWR, 12,500 lbs (5670 kg) | 2027 | only in: 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O | Factory-verified |
| 9J4 | Bumper, rear, delete | 2025–2027 | Factory-verified | |
| 9L3 | Spare tire delete | 2025–2027 | deletes the spare tire and wheel | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 9N2 | GVWR, 10,050 lbs (4559 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| 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 | Factory-verified |
| A2S | Seat adjuster, driver 4-way manual | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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) | Factory-verified |
| A45 | Driver memory | 2025–2027 | only in: 2500 HD and 3500 HD pickup; recalls driver presets for the power driver seat and outside mirrors | Factory-verified |
| 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 | Factory-verified |
| A50 | Seats, front bucket, with center console | 2025–2027 | AT4, AT4X, Denali, Denali Ultimate: S; SLE, SLT: O; Pro: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| A7E | Seat adjuster, passenger 4-way manual | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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) | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| AED | Window, power, front, passenger express down | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| AEQ | Windows, power, rear, express down | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| AKO | Glass, deep-tinted | 2025–2027 | Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| AKP | Glass, solar absorbing, tinted | 2025–2027 | Pro: included in the trim group, upgradeable; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| AQQ | Remote keyless entry | 2025–2027 | Factory-verified | |
| AU3 | Door locks, power | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| AXG | Windows, power, front, driver express up and down | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| B30 | Floor covering, color-keyed carpeting | 2025–2027 | Factory-verified | |
| B32 | Floor mats, front, rubberized vinyl | 2025–2027 | SLE: S; Pro: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| B33 | Floor mats, rear, rubberized vinyl | 2025–2027 | SLE: S; Pro: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| B3L | Assist steps, power retractable, black, with LED lighting | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| BG9 | Floor covering, rubberized vinyl | 2025–2027 | Pro: S; SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| BHP | Winter grille cover | 2025–2027 | Denali Ultimate: S; Pro, SLE, SLT, AT4, AT4X, Denali: O | Factory-verified |
| BKE | Floor liners, premium, with removable carpet insert, rear | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| BKF | Floor liners, premium, with removable carpet insert, front | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| BTM | Push button start | 2025–2027 | Factory-verified | |
| BTV | Remote vehicle starter system | 2025–2027 | SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered | Factory-verified |
| BVQ | Assist steps, chrome tubular, 6 inch rectangular, cab length | 2025–2027 | only in: 2500 HD and 3500 HD pickup; factory installed | Factory-verified |
| BWN | CornerStep, rear bumper | 2025–2027 | only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| C3T | GVWR, 11,250 lbs (5103 kg) | 2027 | only in: 3500 HD pickup; Pro: O; SLE, SLT, AT4, Denali, Denali Ultimate: not offered | Factory-verified |
| C49 | Defogger, rear window, electric | 2025–2027 | Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| C59 | Air vents, rear | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| C67 | Air conditioning, single zone | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| C7A | GVWR, lowered, 10,000 lbs (4536 kg) | 2025–2027 | only in: 2500 HD; lowers the GVWR and significantly decreases towing and payload ratings | Factory-verified |
| C7E | GVWR, 11,000 lbs (4990 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| C7G | GVWR, 10,500 lbs (4763 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| C7L | GVWR, 12,000 lbs (5443 kg) | 2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| C7N | GVWR, 12,300 lbs (5579 kg) | 2027 | only in: 2500 HD; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O; AT4X: not offered | Factory-verified |
| C7V | GVWR, 11,600 lbs (5262 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| C7W | GVWR, 11,400 lbs (5171 kg) | 2027 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| C9V | GVWR, 12,700 lbs (5761 kg) | 2027 | only in: 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| CJ2 | Air conditioning, dual-zone automatic climate control | 2025–2027 | Factory-verified | |
| CKF | GVWR, 11,025 lbs (5001 kg) | 2025–2026 | only in: 2500 HD; AT4X: O; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered | Factory-verified |
| CKJ | GVWR, 10,950 lbs (4967 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| CKM | GVWR, 10,960 lbs (4971 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| D31 | Mirror, inside rearview, manual tilt | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| D72 | Door handles, black grained | 2025–2027 | Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| D75 | Door handles, body-color | 2025–2027 | Factory-verified | |
| 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 | Factory-verified | |
| DD8 | Mirror, inside rearview, auto-dimming | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| DP6 | Mirror caps | 2025–2027 | only in: 2500 HD and 3500 HD pickup; the 3500 HD lists print "Mirror caps, high gloss Black" | Factory-verified |
| DP9 | Mirror caps, chrome | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified | |
| 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 | Factory-verified |
| 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 | Factory-verified |
| E20 | Door handles, chrome | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| G1Y | GVWR, 11,500 lbs (5216 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| 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 | Factory-verified |
| G4H | GVWR, 11,900 lbs (5398 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| J61 | Brakes, 4-wheel antilock, 4-wheel disc, with DURALIFE rotors | 2025–2026 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| JBP | Brake lining wear indicator | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| JFG | GVWR, 10,200 lbs (4627 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFH | GVWR, 10,300 lbs (4672 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFJ | GVWR, 10,600 lbs (4808 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFK | GVWR, 10,700 lbs (4854 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFL | GVWR, 10,800 lbs (4899 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFM | GVWR, 10,900 lbs (4944 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| JFN | GVWR, 11,100 lbs (5035 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JFO | GVWR, 11,200 lbs (5080 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| 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 | Factory-verified |
| JGA | GVWR, 10,150 lbs (4604 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JGB | GVWR, 10,250 lbs (4649 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| JGC | GVWR, 10,350 lbs (4695 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JGD | GVWR, 10,450 lbs (4740 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| JGE | GVWR, 10,550 lbs (4785 kg) | 2025–2026 | only in: 2500 HD | Factory-verified |
| JGF | GVWR, 10,650 lbs (4831 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| JGG | GVWR, 10,750 lbs (4876 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| JGH | GVWR, 10,850 lbs (4921 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| JGJ | GVWR, 11,050 lbs (5012 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE, SLT, AT4, Denali: O; AT4X, Denali Ultimate: not offered | Factory-verified |
| JGK | GVWR, 11,150 lbs (5058 kg) | 2025–2027 | only in: 2500 HD | Factory-verified |
| JGL | GVWR, 11,350 lbs (5148 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| JGM | GVWR, 11,450 lbs (5194 kg) | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| JGN | GVWR, 11,550 lbs (5239 kg) | 2025–2026 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| JGP | GVWR, 11,750 lbs (5330 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| 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 | Factory-verified |
| JGR | GVWR, 11,850 lbs (5375 kg) | 2025–2027 | only in: 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| JGS | GVWR, 12,150 lbs (5511 kg) | 2025–2027 | only in: 2500 HD and 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| JGT | GVWR, 12,250 lbs (5557 kg) | 2025–2027 | only in: 3500 HD pickup; single rear wheels on the 3500 HD | Factory-verified |
| 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 | Factory-verified |
| JL1 | Trailer brake controller, integrated | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| K05 | Engine block heater | 2024–2027 | 2024: GM Authority 2024 changes page | Factory-verified |
| K1O | Air filtration monitoring | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| K34 | Cruise control | 2025–2026 | steering wheel-mounted; Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| K40 | Exhaust brake | 2024–2027 | 2024: GM Authority 2024 changes page | Factory-verified |
| K47 | Air filter, heavy-duty | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| K4C | Wireless charging | 2025–2027 | SLE, SLT: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered | Factory-verified |
| K4Z | Battery, auxiliary, 700 cold-cranking amps/70 amp-hr | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali: O; Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| KC4 | Cooling, external engine oil cooler | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| KC5 | Power outlet, front auxiliary, 12 volt | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| KI3 | Steering wheel, heated | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| KNP | Cooling, auxiliary external transmission oil cooler | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| KSG | Adaptive cruise control | 2024–2027 | 2024: GM Authority 2024 changes page | Factory-verified |
| KW5 | Alternator, 220 amps | 2024–2027 | 2024: GM Authority 2024 changes page; Denali Ultimate: S; Pro, SLE, SLT, AT4, AT4X, Denali: O | Factory-verified |
| KW7 | Alternator, 170 amps | 2025–2027 | Factory-verified | |
| N2L | Fuel tank, rear only, 40 gallon | 2025–2027 | only in: 3500 HD CC | Factory-verified |
| N2N | Fuel tank, front and rear, 63.5 gallon (240 liters) | 2025–2027 | only in: 3500 HD CC | Factory-verified |
| N33 | Steering column, tilt-wheel, manual, with wheel locking security feature | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| N57 | Steering wheel, wrapped | 2025–2027 | Factory-verified | |
| NK5 | Steering wheel, urethane | 2025–2027 | Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| NP5 | Steering wheel, leather-wrapped | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| P03 | Wheel trim, painted center caps | 2025–2026 | only in: 3500 HD pickup and 3500 HD CC | Factory-verified |
| P06 | Wheel trim, chrome trim skins and chrome center caps | 2025–2026 | only in: 3500 HD pickup and 3500 HD CC | Factory-verified |
| P0H | OnStar Connect Plus, 12 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0I | OnStar Connect Plus, 24 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0J | OnStar Protect, 24 months | 2025–2027 | the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0K | OnStar Protect, 36 months | 2025–2027 | the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0L | OnStar Protect, 48 months | 2025–2027 | the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0Q | OnStar Protect, 60 months | 2025–2027 | the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0U | OnStar Protect, 12 months | 2025–2027 | the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0V | OnStar Telematics, 12 months | 2025–2027 | the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0W | OnStar Telematics, 24 months | 2025–2027 | the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0X | OnStar Telematics, 36 months | 2025–2027 | the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0Y | OnStar Telematics, 48 months | 2025–2027 | the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P0Z | OnStar Telematics, 60 months | 2025–2027 | the 2025 lists name it OnStar Insights; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1N | API Pro, 12 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1O | API Pro, 24 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1P | API Pro, 36 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1Q | API Elite, 6 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1R | API Starter, 6 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1S | API Starter, 12 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1T | API Starter, 24 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| P1U | API Starter, 36 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PPW | Wireless phone projection, for Apple CarPlay and Android Auto | 2025–2027 | Factory-verified | |
| PQG | OnStar Connect Plus, 36 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQH | OnStar Connect Plus, 48 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQI | OnStar Connect Plus, 60 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQL | OnStar Video Telematics with hardware, 12 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQM | OnStar Video Telematics with hardware, 24 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQP | OnStar Video Telematics with hardware, 36 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQQ | OnStar Video Telematics with hardware, 48 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PQT | OnStar Video Telematics with hardware, 60 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| PR7 | SiriusXM, additional 21 months of the SXM Platinum Plan | 2025 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PR8 | SiriusXM, additional 33 months of the SXM Platinum Plan | 2025 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| PRB | OnStar One, 3 years | 2025–2027 | the 2027 lists print "3 Years OnStar One (Standalone)"; requires order type TRE or SRE | Factory-verified |
| PRE | API Elite, 12 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| PYT | Wheels, 18" (45.7 cm), 8-spoke painted steel, silver | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| QF6 | Tires, LT275/70R18E, all-terrain, blackwall | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | 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 | Factory-verified |
| QHY | Tires, LT235/80R18, all-terrain, blackwall | 2025–2027 | only in: 3500 HD pickup and 3500 HD CC | Factory-verified |
| QK1 | Tailgate, standard | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| QK2 | Tailgate, GMC MultiPro | 2025–2027 | only in: 2500 HD and 3500 HD pickup; six functional load and access features | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| QWF | Tires, LT265/70R18E, all-terrain, blackwall | 2027 | only in: 2500 HD; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| QXT | Tires, LT265/70R17E, all-terrain, blackwall | 2025–2026 | only in: 2500 HD; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| QZT | Tires, LT235/80R17E, all-terrain, blackwall | 2025–2026 | only in: 3500 HD pickup and 3500 HD CC | Factory-verified |
| 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 | Factory-verified |
| R6P | SiriusXM, 3 years | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| R7Z | API Pro, 6 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| R9V | Mobile Service Plus, 3 years | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| R9W | Mobile Service Plus, deleted | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| R9Y | Mobile Service Plus, 1 year | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| RFS | API Elite, 36 months | 2026–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| RIA | LPO, all-weather floor liner | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| RN2 | LPO, illuminated front GMC emblem | 2025–2027 | only in: 2500 HD and 3500 HD pickup; red; dealer-installed | Factory-verified |
| RN6 | Wheels, 22", Transit steel, painted black | 2025–2027 | only in: 2500 HD; AT4, Denali, Denali Ultimate: O; Pro, SLE, SLT, AT4X: not offered | Factory-verified |
| RSR | Rear seat reminder | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| RVQ | LPO, black tubular assist steps, 6 inch rectangular | 2025–2027 | Factory-verified | |
| RVS | LPO, black tubular assist steps, 4 inch round | 2025–2027 | Factory-verified | |
| S0M | LPO, Denali illuminated door sills | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| S1O | LPO, console-mounted safe | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| S3I | LPO, GMC illuminated puddle lamp emblem | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| S41 | LPO, rear wheelhouse liners | 2025–2027 | only in: 3500 HD pickup | Factory-verified |
| S6L | LPO, sport step, black | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| SAF | Tire carrier lock | 2025–2026 | only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| SBL | LPO, 22" (55.9 cm) gloss black aluminum wheels | 2024–2027 | only in: 2500 HD; 2024: GM Authority 2024 changes page | Factory-verified |
| SBZ | LPO, sport pedal cover kit | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| SF6 | LPO, body color wheel arch moldings | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| SFE | LPO, wheel locks | 2025–2027 | only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: O | Factory-verified |
| SFZ | LPO, black GMC emblems | 2026–2027 | only in: 2500 HD and 3500 HD pickup; the pickup 2500 HD lists print "front"; dealer-installed | Factory-verified |
| SHH | LPO, 20" (50.8 cm) high gloss black painted wheels | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| SKX | LPO, 20" (50.8 cm) high gloss black aluminum wheels with machined accents | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| SPZ | LPO, black lug nut and wheel lock kit | 2026–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| T3U | Fog lamps, LED | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| 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 | Factory-verified |
| TDM | Teen driver | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| TQ5 | IntelliBeam | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| 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 | Factory-verified |
| TRO | LPO, auxiliary trailer camera, wired | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| U01 | Lamps, roof marker, smoked amber, LED | 2025–2027 | not available with the California emissions requirements (YF5) on single rear wheels | Factory-verified |
| U2K | SiriusXM, trial subscription | 2025–2027 | Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| U95 | Audio system feature, 2 speakers | 2025–2027 | Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| UBI | USB ports, 2, charge only, rear | 2025–2027 | Pro: O; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| UBJ | USB ports, 2, charge/data, on the instrument panel | 2025–2027 | the 3500 HD CC lists print "USB ports, 2" | Factory-verified |
| 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 | Factory-verified |
| UDC | Driver information center, 3.5" diagonal monochromatic display | 2025–2027 | Pro: S; SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| UDV | Driver information center, enhanced, 12.3" diagonal reconfigurable multicolor digital display | 2024–2027 | 2024: GM Authority 2024 changes page | Factory-verified |
| UE1 | OnStar services capable | 2025–2027 | Factory-verified | |
| UE4 | Following distance indicator | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| 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 | Factory-verified |
| UEU | Forward collision alert | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| 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 | Factory-verified |
| UF3 | High idle switch | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| UFL | Lane departure warning | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| UH5 | Rear seat belt indicator | 2025–2027 | only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| 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 | Factory-verified |
| UJM | Tire pressure monitoring system | 2025–2027 | only in: 3500 HD CC; Pro, SLE: S | Factory-verified |
| 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 | Factory-verified |
| UK3 | Steering wheel audio controls | 2025–2027 | SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group; Pro: not offered | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| UKT | Front pedestrian and bicyclist braking | 2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: included in the trim group | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| URD | GMC premium information display, 13.4" diagonal multicolor touch screen | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| 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 | Factory-verified |
| UV6 | Head-up display, multicolor, 15" diagonal | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| UY2 | Trailering wiring provisions | 2025–2027 | only in: 2500 HD and 3500 HD pickup; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| V46 | Bumper, front, chrome lower | 2025–2027 | Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| V76 | Recovery hooks, front, frame-mounted, black | 2025–2027 | Pro, SLE, SLT: S; AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| VB5 | Bumper, front, body-color lower | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| VBJ | LPO, rear underseat storage, composite storage bin | 2025–2027 | Crew Cab includes a lockable lid; requires Crew Cab or Double Cab; dealer-installed | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| VK3 | License plate kit, front | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O | Factory-verified |
| 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 | Factory-verified |
| VOZ | LPO, hard folding truck bed cover by RealTruck Advantage | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| VQK | LPO, front and rear black molded splash guards | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| VQO | LPO, black assist steps | 2025–2027 | Factory-verified | |
| 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 | Factory-verified |
| VT5 | Bumper, rear, body-color, with CornerSteps | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| VV4 | Wi-Fi hotspot capable | 2025–2027 | Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: S | Factory-verified |
| VXH | LPO, assist steps, chrome tubular | 2025–2027 | 6 inch rectangular (named in the assist step and floor liner package text) | Factory-verified |
| VXJ | LPO, assist steps, chrome tubular | 2025–2027 | 4 inch round (named in the assist step and floor liner package text) | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| ZWF | Tire, spare, LT265/70R18E, all-season, blackwall | 2027 | only in: 2500 HD; Pro, SLE: S; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| ZYG | Tire, spare, LT275/70R18, all-terrain, blackwall | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| 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 | Factory-verified |
| Paint | ||||
| 01U | Paint, special exterior color | 2025–2027 | Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered | Factory-verified |
| 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 | Factory-verified |
| 9V5 | Paint, Woodland Green | 2025–2027 | SEO paint; may need extended lead time; touch-up WA-9015 | Factory-verified |
| 9W3 | Paint, Wheatland Yellow | 2025–2027 | SEO paint; may need extended lead time; touch-up WA-253A | Factory-verified |
| 9W4 | Paint, Tangier Orange | 2025–2027 | SEO paint; may need extended lead time; touch-up WA-9417 | Factory-verified |
| G1W | Paint, White Frost Tricoat | 2025 | touch-up WA-140X | Factory-verified |
| G42 | Paint, Coastal Dune | 2026–2027 | new for 2026; touch-up WA-234L | Factory-verified |
| 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 | Factory-verified |
| G6M | Paint, Titanium Rush Metallic | 2024–2027 | 2024: GM Authority 2024 changes page; touch-up WA-618G | Factory-verified |
| G7C | Paint, Cardinal Red | 2025–2027 | touch-up WA-130X | Factory-verified |
| GAZ | Paint, Summit White | 2025–2027 | touch-up WA-8624 | Factory-verified |
| GBA | Paint, Onyx Black | 2025–2027 | touch-up WA-8555 | Factory-verified |
| 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 | Factory-verified |
| GNT | Paint, Volcanic Red Tintcoat | 2024–2027 | 2024: GM Authority 2024 changes page; touch-up WA-170H | Factory-verified |
| GXD | Paint, Sterling Metallic | 2024–2027 | 2024: GM Authority 2024 changes page; touch-up WA-130H | Factory-verified |
| GXP | Paint, Downpour Metallic | 2024–2027 | 2024: GM Authority 2024 changes page; touch-up WA-136H | Factory-verified |
| Interior Trim | ||||
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| 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 | Factory-verified |
| Internal / Process | ||||
| 5M7 internal | Speedometer calibration | 2025–2027 | the 2500 HD and 3500 HD pickup lists print "Speedometer calibration, provisions" | Factory-verified |
| 8X8 internal | Label, fasten seat belts | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| FE9 internal | Emissions, federal requirements | 2025–2027 | Factory-verified | |
| NB8 internal | Emissions override, California | 2025–2027 | Factory-verified | |
| NB9 internal | Emissions override, state-specific | 2025–2027 | Factory-verified | |
| NC7 internal | Emissions override, federal | 2025–2027 | Factory-verified | |
| NE1 internal | Emissions, state requirements | 2025–2027 | 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" | Factory-verified |
| SFW internal | Back-up alarm calibration | 2025–2027 | Factory-verified | |
| SQE internal | 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 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| TBL internal | 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 | only in: 2500 HD and 3500 HD CC | Factory-verified |
| TCE internal | 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 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| TCH internal | 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 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| TCL internal | Ship thru, produced in Flint Assembly and shipped to Kerr Industries, Warren, MI, returned to Flint Assembly for shipping to final destination | 2025–2027 | Factory-verified | |
| TDE internal | 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 | Factory-verified | |
| TVY internal | Ship thru, produced and shipped to Anchorage VDC then to TK Services and returned to Anchorage VDC for shipping to final destination | 2025–2027 | Factory-verified | |
| TZS internal | 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 | Factory-verified | |
| VCB internal | 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 | Factory-verified | |
| VDK internal | Ship thru, produced in Flint Assembly and shipped to Royal Truck Body, Flint, MI, returned to Flint Assembly for shipping to final destination | 2027 | only in: 2500 HD and 3500 HD CC | Factory-verified |
| VDR internal | 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 | Factory-verified | |
| VEW internal | 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 | Factory-verified | |
| VFW internal | 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 | Factory-verified | |
| VHR internal | 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 | Factory-verified | |
| VSX internal | Trailering information label | 2025–2027 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| VTV internal | 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 | only in: 2500 HD and 3500 HD pickup | Factory-verified |
| VUD internal | 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 | Factory-verified | |
| VUI internal | 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 | Factory-verified | |
| YF5 internal | Emissions, California state requirements | 2025–2027 | Factory-verified | |
Source document: gmc/sierra-hd-t1xx.md. Rows marked — record an option the factory offered whose RPO code is not documented in the consulted sources.