RPOARCHIVE
Loading index…

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

    Source document

    docs/rpo/chevrolet/silverado-md-gm515.md

    Interactive view →

    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive Silverado Medium Duty (GM515, 2019–2026) page.

    Chevrolet Silverado Medium Duty (4500 HD, 5500 HD, 6500 HD; GM515, 2019–2026)

    NICB's VIN manuals list the Chevrolet Silverado Medium Duty under manufacturer identifier 1HT as the GM515 conventional cab, 4x2 (series KH) and 4x4 (series KJ), with the Duramax 6.6L turbo-diesel V8 as the engine type (PV; the 2026 manual names it L5D); its 2019, 2022 (with 2021) and 2026 (with 2025) manuals carry the entry. The codes here come from GM's 2025 and 2026 fleet order guides for the 4500 HD, 5500 HD and 6500 HD: their RPO code lists (369 codes), the guides' page-1 trim groups (1WT, 1LT) and their COLOR AND TRIM pages (37 codes the lists do not print). The lists print one engine (L5D), eighteen Allison 6 speed automatics, and the wheelbase, GVWR, GCWR, axle, suspension, tire and body-builder provisions, plus the 4500, 5500 and 6500 series codes (R7M, R7N, R7P). The archive holds no dated list for 2019 through 2024, so every row is 2025 or 2026. Codes shared with the Silverado HD (T1XX) doc use its wording unless these lists print something different, and the Notes say where they do.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    L5D Engine, Duramax 6.6L turbo-diesel V8, B20 diesel compatible 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Transmissions

    Code Description Years Models/Notes Confidence
    MA6 Transmission, Allison A1700PTS, 6 speed automatic, close-ratio, double overdrive, non-conforming school bus or shuttle bus 2025–2026 gear ratios 3.10, 1.80, 1.40, 1.00, 0.70 and 0.61; 26,001 lb GCW maximum; requires PTX and a park pawl; for GVW at or below 19.5K ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MB6 Transmission, Allison A2700PTS, 6 speed automatic, close-ratio, double overdrive, non-conforming school bus or shuttle bus 2025–2026 gear ratios 3.10, 1.80, 1.40, 1.00, 0.70 and 0.61; 26,001 lb GCW maximum (the list prints 26,001K); requires PTX and a park pawl; for GVW above 19.5K ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MBV Transmission, Allison A2750RDS, 6 speed automatic, close-ratio, double overdrive, rugged duty service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MBW Transmission, Allison A2750MH, 6 speed automatic, close-ratio, double overdrive, motor home 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MBX Transmission, Allison A2750HS, 6 speed automatic, close-ratio, double overdrive, highway service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MBY Transmission, Allison A2750EVS, 6 speed automatic, close-ratio, double overdrive, emergency service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ME0 Transmission, Allison A1750MH, 6 speed automatic, close-ratio, double overdrive, motor home 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MF0 Transmission, Allison A2700MH, 6 speed automatic, close-ratio, double overdrive, motor home 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MG0 Transmission, Allison A2700EVS, 6 speed automatic, close-ratio, double overdrive, emergency service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MH1 Transmission, Allison A1700EVS, 6 speed automatic, close-ratio, double overdrive, emergency service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MHV Transmission, Allison A1750EVS, 6 speed automatic, close-ratio, double overdrive, emergency service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MI0 Transmission, Allison A1750RDS, 6 speed automatic, close-ratio, double overdrive, rugged duty service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MIA Transmission, Allison A2700RDS, 6 speed automatic, close-ratio, double overdrive, rugged duty service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MIU Transmission, Allison A1700RDS, 6 speed automatic, close-ratio, double overdrive, rugged duty service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MIX Transmission, Allison A1700MH, 6 speed automatic, close-ratio, double overdrive, motor home 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MJ0 Transmission, Allison A1750HS, 6 speed automatic, close-ratio, double overdrive, highway service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MWA Transmission, Allison A1700HS, 6 speed automatic, close-ratio, double overdrive, highway service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    MWB Transmission, Allison A2700HS, 6 speed automatic, close-ratio, double overdrive, highway service 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Axles

    Code Description Years Models/Notes Confidence
    005 Axle, rear, 4.56 ratio 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    008 Axle, rear, 4.88 ratio 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    013 Axle, rear, 3.73 ratio, maximum road speed 85 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    066 Axle, rear, 4.10 ratio 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    092 Axle, rear, 4.30 ratio 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F0C Axle to end of frame, 49 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F0D Axle to end of frame, 63 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F0G Axle to end of frame, 83 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F0I Axle to end of frame, 75 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F0K Axle to end of frame, 91 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FN1 Axle, rear, 10,000 lb (4,536 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTA Axle, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTB Axle, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTC Axle, front, 6,250 lb (2,835 kg), Dana Spicer D800-N, I-beam, non-driving 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTL Axle, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTN Axle lubricant, front, synthetic 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTO Axle lubricant, rear, synthetic oil, EmGard FE 75W-90 2025–2026 the list prints "EmGard FE -75W-90" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    G80 Differential, rear, heavy-duty locking 2025–2026 the Silverado HD (T1XX) doc reads G80 "Differential, rear, auto-locking" from the pickup lists ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    G86 Axle, limited slip 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GL4 Axle, rear, 11,000 lb (4,999 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    HD1 Axle, rear, 15,000 lb (6,804 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    HD2 Axle, rear, 13,500 lb (6,124 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    J27 Axle, rear, 15,500 lb (7,031 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Packages & Trims

    Code Description Years Models/Notes Confidence
    1LT Trim group, LT 2025–2026 page-1 column heading LT: the same four models as 1WT ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1 confirmed
    1WT Trim group, Work Truck 2025–2026 page-1 column heading WT: models CC56403 (2WD regular cab), CC56043 (2WD crew cab), CK56403 (4WD regular cab) and CK56043 (4WD crew cab) ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1 confirmed
    ANC Shuttle Bus Package 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ANK School Bus Package, non-conforming 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCH Motorhome Package 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCI Commercial Rental 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCJ Vocational Specific Heavy Suspension Package 2025–2026 for 165 inch wheelbase trucks only; allows 7,000 and 8,000 lb front axles and/or 15,500 lb rear spring suspension for utility/service, aerial lift/bucket, plow/spreader and landscape dump bodies ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCK Commercial Lease 2026 the Silverado HD (T1XX) doc reads PCK on the 3500 HD chassis cab as Ambulance / Fire / Rescue Package ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCL Commercial Rental 2026 the Silverado HD (T1XX) doc reads PCL on the pickups as Convenience Package ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCM Wrecker/Rollback Vocational Package 2025–2026 the Silverado HD (T1XX) doc reads PCM on the pickups as Convenience Package II ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PCN Enhanced Traction Package 2025–2026 the Silverado HD (T1XX) doc reads PCN on the pickups as LTZ Convenience Package II ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R7D Rear suspension, LiquidSpring prep confirmation, acknowledges the LiquidSpring prep package selection 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R7M 4500 HD Series 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R7N 5500 HD Series 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R7P 6500 HD Series 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VYU Snow Plow Prep Package 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YF2 Emergency Service Package 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Equipment

    Code Description Years Models/Notes Confidence
    379 Seat belt, front, Orange 2025–2026 the 2025 list prints "Seat Belt, Orange" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    3F9 Seat belt, front, Red 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5D1 Bumper, front, Gray 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5DX Electrical provisions, rear of cab, upfitter 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5DY Electrical provisions, rear of frame, upfitter 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5H1 Key system 2025–2026 the Silverado HD (T1XX) doc reads this code "Key equipment, two additional key fobs" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5HP Keys, 6 additional 2025 the 2025 fleet guide key page prints "Not available to order at this time" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.123 confirmed
    5T5 Seat trim override 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    6C7 Dome lamp prep, passenger 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    6E2 Key, common, complete vehicle fleet 2025–2026 orderable; requires a Fleet or Government order; alternate to 6E8; not compatible with previous model years; the Silverado 1500 doc reads it "Key, common, all keys coded alike" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.123 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 confirmed
    6E8 Key, common, complete vehicle fleet 2025–2026 orderable; requires a Fleet or Government order; alternate to 6E2; not compatible with previous model years; the Silverado 1500 doc reads it "Key, common, all keys coded alike" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.123 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 confirmed
    6Y5 Ornamentation, not installed 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    719 Seat belt, Black 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    7X6 Spotlamp prep kit 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    7X7 Spotlamps, left and right-hand pillar mounted, halogen 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    7Y7 Batteries, heavy-duty, dual, 1100 cold-cranking amps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    7Y8 Batteries, heavy-duty, dual, 1300 cold-cranking amps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    7Y9 Batteries, heavy-duty, triple, 2250 cold-cranking amps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    8E4 Additional fuel, 5 gallons 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    8E8 Bumper, front, Black 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    8F2 Ornamentation, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    8H5 Bumper, front, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    91B Rear suspension, LiquidSpring prep, single volume (incomplete), 13,500 lb (6,123 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    91C Rear suspension, LiquidSpring prep, stacked volume (incomplete), 13,500 lb (6,123 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    91D Rear suspension, LiquidSpring prep, single volume (incomplete), 15,500 lb (7,031 kg) 2025–2026 the list prints 7673 kg ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    91E Rear suspension, LiquidSpring prep, stacked volume (incomplete), 15,500 lb (7,031 kg) 2025–2026 the list prints 7673 kg ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9B9 Governor, electronic speed sensor, set to 70 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9C2 Governor, electronic speed sensor, set to 65 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9D4 Governor, electronic speed sensor, set to 55 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9D6 Governor, electronic speed sensor, set to 79 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9D7 Governor, electronic speed sensor, set to 75 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9D9 Mirror, inside rearview, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9L3 Spare tire, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9L7 Upfitter switch kit 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9L9 Wiring harness, accessory, for 9L7 wiring to junction block 2025–2026 includes connector and blunt-cut wires ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9S1 Seat, front center, delete, vinyl 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    9U3 Seat, front center, delete, cloth 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    A31 Windows, power 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    A52 Seats, front 40/20/40 split bench 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    A61 Rear window, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    A68 Seat, rear, 60/40 folding bench 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    A95 Seats, front, cloth bucket 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AE7 Seats, front 40/20/40 split bench 2025–2026 the color and trim pages pair it with vinyl and cloth seat trim in 1WT; the Silverado HD (T1XX) doc reads this code more briefly from its 2023 Upfitter list ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AG1 Seat adjuster, driver, 10-way power 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AJ7 Airbags 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AKO Glass, deep-tinted 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AKP Glass, solar absorbing 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    APL Passenger seat, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AQQ Remote keyless entry 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ATZ Seat, rear, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AU3 Door locks, power 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AY0 Airbags, single-stage frontal, seat-mounted side-impact and head-curtain, driver and front outboard passenger 2025–2026 crew cab: head-curtain airbags for front and rear outboard seats; regular cab: front outboard seats only; the Silverado HD (T1XX) doc reads AY0 on the pickups as dual-stage frontal airbags ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AY1 Airbags, frontal and seat-mounted side-impact for driver only, with head-curtain on both sides and rollover protection 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    AZ2 Airbags 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    BG9 Floor covering, rubberized vinyl, Graphite-colored 2025–2026 the Silverado HD (T1XX) doc reads it without "Graphite-colored" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    BTN Battery, top post, threaded 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    BTV Remote vehicle starter system 2025–2026 the lists print "Remote Start" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C49 Defogger, rear window 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C5B GVWR, 15,000 lb (6,804 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C5D GVWR, 22,500 lb (10,206 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C62 HVAC provisions, auxiliary A/C compressor 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C67 Air conditioning, single-zone 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C7P GVWR, 16,000 lb (7,257 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C7R GVWR, 16,500 lb (7,484 kg) 2025–2026 the list prints "PDF /" before the entry ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C7Y GVWR, 14,001 lb (6,350 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C99 Airbag deactivation switch, frontal passenger side 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    C9U GVWR, 22,940 lb (10,405 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    D07 Console, floor 2025–2026 the Silverado HD (T1XX) doc reads it "Center console, floor" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DB9 GVWR, 23,000 lb (10,433 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DD5 GVWR, 21,000 lb (9,525 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DD7 GVWR, 23,500 lb (10,659 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DD8 Mirror, inside rearview, auto-dimming 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DF2 Mirrors, outside, high-visibility vertical camper-style, Black 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DGD Mirrors, outside, Black, manual folding and adjusting, high-visibility vertical camper-style, lower convex spotter glass, 102 inch wide load 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DGP Mirrors, outside, Black, heated, power-adjustable, high-visibility vertical camper-style, lower convex spotter glass, manual folding, 102 inch wide load 2025–2026 the convex glass is not heated and not power-adjustable ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DH6 Visors, driver and front passenger, with illuminated vanity mirrors 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DP9 Mirror caps, chrome 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DPN Mirrors, outside, heated power-adjustable vertical trailering, upper glass 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    DRZ Rear camera mirror 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    E01 Assist steps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    E0N Assist steps, aluminum 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    E20 Door handles, outside, chrome 2025–2026 the Silverado HD (T1XX) doc reads it "Door handles, chrome" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ED5 Wheelbase, 201 inch (510.5 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ED9 Wheelbase, 165 inch (419.1 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    EM1 Wheelbase, 199 inch (505.5 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    EQB Wheelbase, 219 inch (556.3 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ER2 Wheelbase, 189 inch (480.1 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    F59 Stabilizer bar, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FBC Wheelbase, 243 inch (617.2 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FF3 Oil seal, front hub, Chicago Rawhide nitrile, for oil-lubricated wheel bearings 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FG0 Front hubs, oil-filled, synthetic 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FHX Fuel, diesel, B20 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FK6 Front suspension, 7,000 lb (3,175 kg), multi-leaf 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FNP Front fender extension, painted body color 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FNV Wheelbase, 175 inch (444.5 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FPF DPF (diesel particulate filter), manual regeneration 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FPN Wheelbase, 231 inch (586.7 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FRP Wheelbase, 235 inch (596.9 cm) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FSN Front suspension, 8,000 lb (3,629 kg), multi-leaf 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTV Front suspension, 7,500 lb (3,402 kg), multi-leaf 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FTW Front suspension, 6,250 lb (2,835 kg), multi-leaf, includes shock absorbers 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    FU7 Rear suspension, 15,500 lb (7,031 kg), multi-leaf 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    G40 Rear suspension, air, 12,000 lb (5,443 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    G68 Shock absorbers, rear 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    G7K Antenna equipment 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GP1 Rear suspension, air, 13,500 lb (6,123 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GP8 Rear suspension, air, 15,500 lb (7,031 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GR3 Rear suspension, 11,000 lb (4,990 kg), multi-leaf 2025–2026 the list omits the unit after 11,000 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GR4 Rear suspension, 13,500 lb (6,123 kg), multi-leaf 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GZG GVWR, 19,500 lb (8,845 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GZH GVWR, 21,500 lb (9,752 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GZJ GVWR, 18,000 lb (8,165 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    GZX GVWR, 17,500 lb (7,938 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    IO3 Audio system, 4.2 inch diagonal color display, AM/FM stereo with USB port and auxiliary jack 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    IO5 Audio system, Chevrolet Infotainment System, 8 inch diagonal color touch-screen 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    IOR Audio system 2025–2026 the Silverado HD (T1XX) doc reads it "Audio system, Chevrolet Infotainment 3" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    J48 Brakes, hydraulic 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    J69 Brake, parking 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    JG1 Prop shaft guard, steel 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    JL1 Trailer brake controller, integrated 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    JPY Air dryer, heated 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    JPZ Suspension air control valve, air release valve with switch in cab 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    JTR Taillamp wiring harness provisions 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    K05 Engine block heater 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    K34 Cruise control 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    K40 Exhaust brake 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    K4C Wireless charging 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KA1 Seats, heated, driver and front outboard passenger 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KG4 Alternator, 150 amps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KHB Alternators, dual 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KI4 Power outlet 2025–2026 the 2025 list prints "110-volt" and the 2026 list "120-volt" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KT0 Heater hose, silicone 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KUD Heater hose clamps, Breeze Belleville washer type 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KUT Air compressor accessory drive 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KW5 Alternator, 220 amps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    LVA Governor, electronic speed sensor, set to 60 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    N12 Exhaust system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    N2L Fuel tank, rear only, 40 gallon 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    N33 Steering column, manual tilt-wheel 2025–2026 the Silverado HD (T1XX) doc reads it "Steering column, tilt-wheel" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NK5 Steering wheel 2025–2026 the Silverado HD (T1XX) doc reads it "Steering wheel, urethane" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NP5 Steering wheel, leather-wrapped 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NPJ Exhaust system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NPK Exhaust system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NPR Exhaust system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NSQ Fuel tank, front and rear, 65 gallon total 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NVK Fuel tank, front, 25 gallon 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NXG Additional fuel, 20 gallons 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    NZZ Skid plate 2025–2026 the Silverado HD (T1XX) doc reads it "Skid plates" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0D Grille guard screen, insect protection 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0J OnStar Protect, 24 months 2025–2026 the 2025 list prints "OnStar Security" with "Months of Service"; the 2026 list "OnStar Protect" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0K OnStar Protect, 36 months 2025–2026 the 2025 list prints "OnStar Security" with "Months of Service"; the 2026 list "OnStar Protect" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0L OnStar Protect, 48 months 2025–2026 the 2025 list prints "OnStar Security" with "Months of Service"; the 2026 list "OnStar Protect" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0Q OnStar Protect, 60 months 2025–2026 the 2025 list prints "OnStar Security" with "Months of Service"; the 2026 list "OnStar Protect" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0U OnStar Protect, 12 months 2025–2026 the 2025 list prints "OnStar Security" with "Months of Service"; the 2026 list "OnStar Protect" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0V OnStar Telematics, 12 months 2025–2026 the 2025 list prints "OnStar Insights" with "Months of Service"; the 2026 list "OnStar Telematics" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0W OnStar Telematics, 24 months 2025–2026 the 2025 list prints "OnStar Insights" with "Months of Service"; the 2026 list "OnStar Telematics" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0X OnStar Telematics, 36 months 2025–2026 the 2025 list prints "OnStar Insights" with "Months of Service"; the 2026 list "OnStar Telematics" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0Y OnStar Telematics, 48 months 2025–2026 the 2025 list prints "OnStar Insights" with "Months of Service"; the 2026 list "OnStar Telematics" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P0Z OnStar Telematics, 60 months 2025–2026 the 2025 list prints "OnStar Insights" with "Months of Service"; the 2026 list "OnStar Telematics" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1N API Pro, 12 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1O API Pro, 24 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1P API Pro, 36 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1Q API Elite, 6 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1R API Starter, 6 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1S API Starter, 12 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1T API Starter, 24 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    P1U API Starter, 36 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PD7 Wheel, spare, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PQL OnStar Video Telematics with hardware, 12 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PQM OnStar Video Telematics with hardware, 24 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PQP OnStar Video Telematics with hardware, 36 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PQQ OnStar Video Telematics with hardware, 48 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PQT OnStar Video Telematics with hardware, 60 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PR6 SiriusXM, additional 9 months of the SXM Platinum Plan 2025 the 2026 list gives this code another meaning (API Elite, 24 months) ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PR6 API Elite, 24 months 2026 the 2025 list gives this code another meaning (SiriusXM extension of 9 months) ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PR7 SiriusXM, additional 21 months of the SXM Platinum Plan 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PR8 SiriusXM, additional 33 months of the SXM Platinum Plan 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PRB OnStar One, 3 years 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PRE API Elite, 12 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PTO Power take-off, engine control provisions 2025–2026 the Silverado HD (T1XX) doc reads it "Power take-off" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PTX Power take-off (PTO), not installed 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWG Wheels, aluminum, 19.5 x 6.75 inch, set of 6, 8-hole 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWQ Wheels, steel, 19.5 x 6.75 inch, Black painted 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWR Wheels, steel, 19.5 x 6.75 inch, Gray painted 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWS Wheels, steel, 19.5 x 6.75 inch, White painted 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWV Wheels, aluminum, 19.5 x 6.75 inch, set of 4 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWY Wheel, spare, steel, 19.5 x 6.75 inch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    PWZ Wheel, spare, aluminum, 19.5 x 6.75 inch, 8-hole, temporary mount on frame 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    Q8D Mud flaps, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    Q91 Tire valve cap, Haltec flow-thru 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    Q92 Tire valve cap, Alligaro V2B flow-thru 2025–2026 the list prints "flo-thru" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6C GCWR, 37,500 lb (17,009 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6G GCWR, 26,000 lb (11,793 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6I GCWR, 30,000 lb (13,607 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6P SiriusXM, 3 years 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6W GCWR, 34,000 lb (15,422 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R6X GCWR, 35,000 lb (15,875 kg) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R7Z API Pro, 6 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R8G OnStar One Fleet, 12 months 2025 the list prints "OnStar One Business Plus" with "Months of Service"; the Silverado HD (T1XX) doc reads the code "OnStar One Fleet" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R8P OnStar One Fleet, 36 months 2025 the list prints "OnStar One Business Plus" with "Months of Service"; the Silverado HD (T1XX) doc reads the code "OnStar One Fleet" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R8W OnStar One Fleet, 60 months 2025 the list prints "OnStar One Business Plus" with "Months of Service"; the Silverado HD (T1XX) doc reads the code "OnStar One Fleet" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    R8Z OnStar One Fleet, 48 months 2025 the list prints "OnStar One Business Plus" with "Months of Service"; the Silverado HD (T1XX) doc reads the code "OnStar One Fleet" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    RDI LPO, keyless entry keypad 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    RFH OnStar One Fleet, 24 months 2025 the list prints "OnStar One Business Plus" with "Months of Service"; the Silverado HD (T1XX) doc reads the code "OnStar One Fleet" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    RFS API Elite, 36 months 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    S0P LPO, console insert organizer tray 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    T3A Bumper, front, with 4 inch extension 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    T3U Fog lamps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TG5 Single-slot CD/MP3 player 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TR1 Lamps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TRW Provision for cab roof-mounted lamp or beacon 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U01 Lamps, roof marker, Smoked Amber 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U0Y Horn, trumpet style 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U0Z Horn, trumpet style 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U2J SiriusXM, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U2K SiriusXM 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    U73 Antenna, fixed 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UDC Driver information center 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UDD Driver information center, 4.2 inch diagonal color display 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UE0 OnStar, delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UE1 OnStar services capable 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UEA Taillamp delete 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UEH Provisions for electrical switch bank 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UF3 High idle switch 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UGE Lamps 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UK3 Steering wheel audio controls 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UMN Speedometer, miles/kilometers 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UNL Auxiliary harness 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UQ3 Audio system feature, 6-speaker system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UQ5 Audio system feature, 4-speaker system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UTJ Theft-deterrent system 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UTQ Alarm, horn, content theft deterrent, disabled 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UVC Rear vision camera 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UY7 Trailering provisions, trailering wire harness only 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    UZF Backup alarm 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    V22 Grille, chrome 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    V23 Grille guard screen, stone protection (mounted to bumper) 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    V33 Tool kit, rim wrench and handle only 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    V46 Bumper, front, chrome 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    V76 Recovery hooks, front, frame-mounted 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VBJ LPO, rear under-seat storage 2025–2026 the Silverado HD (T1XX) doc reads it "LPO, underseat storage" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VK3 License plate kit, front 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VKW LPO, console insert expandable folder tote 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VND Governor, electronic speed sensor, set to 50 MPH 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VWX Grille 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VXT Incomplete vehicle 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    WRD Work light circuit, provides additional wire for utility light at end of frame 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XBA Tires, front, 225/70R19.5G, highway, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XBB Tires, front, 225/70R19.5G, traction, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XDK Tires, front, 225/70R19.5G, highway, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XEY Tires, front, 225/70R19.5G, highway, blackwall, Pirelli 2025–2026 maximum axle load 7,940 lb ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XEZ Tires, front, 225/70R19.5G, traction, blackwall, Pirelli 2025–2026 maximum axle load 7,940 lb ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XGE Tires, front, 225/70R19.5G, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XGF Tires, front, 225/70R19.5H, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XGG Tires, front, 225/70R19.5G, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XGH Tires, front, 225/70R19.5H, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    XMF Tires, front, 225/70R19.5G, traction, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YAL Tires, rear, 225/70R19.5G, highway, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YAV Tires, rear, 225/70R19.5G, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YAW Tires, rear, 225/70R19.5H, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YAX Tires, rear, 225/70R19.5H, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YAY Tires, rear, 225/70R19.5G, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YBA Tires, rear, 225/70R19.5G, highway, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YBB Tires, rear, 225/70R19.5G, traction, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YEY Tires, rear, 225/70R19.5G, highway, blackwall, Pirelli 2025–2026 maximum axle load 15,000 lb ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YEZ Tires, rear, 225/70R19.5G, traction, blackwall, Pirelli 2025–2026 maximum axle load 15,000 lb ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    YMF Tires, rear, 225/70R19.5G, traction, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBA Tire, spare, 225/70R19.5G, highway, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBB Tire, spare, 225/70R19.5G, traction, Goodyear Range Max 2026 ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBK Tire, spare, 225/70R19.5G, highway, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBT Tire, spare, 225/70R19.5H, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBU Tire, spare, 225/70R19.5G, traction, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBV Tire, spare, 225/70R19.5H, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZBW Tire, spare, 225/70R19.5G, highway, blackwall, Continental 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZEY Tire, spare, 225/70R19.5G, highway, blackwall, Pirelli 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZEZ Tire, spare, 225/70R19.5G, traction, blackwall, Pirelli 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    ZMF Tire, spare, 225/70R19.5G, traction, blackwall, Goodyear 2025 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Paint

    Code Description Years Models/Notes Confidence
    01U Paint scheme, special exterior color 2025–2026 the 2025 list prints "Paint Scheme, Style 1" and the 2026 list "Paint Scheme, solid, SEO"; the Silverado HD (T1XX) doc reads the code "Special exterior color" ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    5I3 Paint, solid, Dark Toreador Red 2025–2026 touch-up WA-334D; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5I4 Paint, solid, Subterranean Metallic 2025–2026 touch-up WA-105V; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5I9 Paint, solid, Doeskin Tan 2025–2026 touch-up WA-9403; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IA Paint, solid, Yellow 2025–2026 touch-up WA-5248; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IC Paint, solid, Yellow 2025–2026 touch-up WA-5445; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5ID Paint, solid, Yellow 2025–2026 touch-up WA-5456; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IE Paint, solid, Iridium Metallic 2025–2026 touch-up WA-121V; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IH Paint, solid, Dark Ming Blue 2025–2026 touch-up WA-722J; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5II Paint, solid, Pepperdust Metallic 2025–2026 touch-up WA-441B; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IK Paint, solid, Inca Gold 2025–2026 touch-up WA-7952; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IL Paint, solid, Green 2025–2026 touch-up WA-7927; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IR Paint, solid, Unripened Green Metallic 2025–2026 touch-up WA-136X; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IT Paint, solid, Yellow 2025–2026 touch-up WA-9414; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IU Paint, solid, Cyber Gray Metallic 2025–2026 touch-up WA-637R; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IW Paint, solid, Indigo Blue 2025–2026 touch-up WA-9792; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IY Paint, solid, Baroque Red Metallic 2025–2026 touch-up WA-142X; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5IZ Paint, solid, Yellow 2025–2026 touch-up WA-215D; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5JA Paint, solid, Orange 2025–2026 touch-up WA-770H; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    5JD Paint, solid, Blue 2025–2026 touch-up WA-454N; listed on the SEO paint color and trim pages; the RPO code lists do not print the code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9F5 Paint, solid, Mosaic Black Metallic 2025–2026 touch-up WA-384A; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9V1 Paint, solid, Graphite Metallic 2025–2026 touch-up WA-457B; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9V4 Paint, solid, Havana Brown Metallic 2025–2026 touch-up WA-439C; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9V5 Paint, solid, Woodland Green 2025–2026 touch-up WA-9015; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9V8 Paint, solid, Smokey Quartz Metallic 2025–2026 touch-up WA-634D; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W1 Paint, solid, Oxford Brown Metallic 2025–2026 touch-up WA-334E; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W2 Paint, solid, Satin Steel Metallic 2025–2026 touch-up WA-464C; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W3 Paint, solid, Wheatland Yellow 2025–2026 touch-up WA-253A; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W4 Paint, solid, Tangier Orange 2025–2026 touch-up WA-9417; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W6 Paint, solid, Deep Ocean Blue Metallic 2025–2026 touch-up WA-409Y; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    9W9 Paint, solid, Shadow Gray Metallic 2025–2026 touch-up WA-626D; listed on the SEO paint color and trim pages ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.122 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 confirmed
    G48 Paint, Auburn Metallic 2025–2026 touch-up WA-613G ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    G6M Paint, Dark Ash Metallic 2025–2026 touch-up WA-618G ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    G7C Paint, Red Hot 2025–2026 touch-up WA-130X ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GA0 Paint, Northsky Blue Metallic 2025–2026 touch-up WA-619D; the Silverado HD (T1XX) doc carries GA0 for 2023 only, named "Some Kinda Blue Metallic" in its 2023 Upfitter list ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GAN Paint, Silver Ice Metallic 2025–2026 touch-up WA-636R; the Silverado HD (T1XX) doc names GAN "Switchblade Silver Metallic" from its 2023 Upfitter list ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GAZ Paint, Summit White 2025–2026 touch-up WA-8624 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GBA Paint, Black 2025–2026 touch-up WA-8555 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GHR Paint, Greenstone Metallic 2025–2026 touch-up WA-610G; the Silverado HD (T1XX) doc names GHR "Cannon Metallic" from its 2023 Upfitter list ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GLT Paint, Glacier Blue Metallic 2025–2026 touch-up WA-327E; premium paint at an additional charge ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GNO Paint, Slate Gray Metallic 2025–2026 touch-up WA-633D ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GXD Paint, Sterling Gray Metallic 2025–2026 touch-up WA-130H ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    GXP Paint, Lakeshore Blue Metallic 2025–2026 touch-up WA-136H ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.117 confirmed
    ZY1 Paint, solid 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Interior Trim

    Code Description Years Models/Notes Confidence
    4AA Interior trim, Jet Black 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    4D7 Interior trim, Jet Black/Dark Ash 2025–2026 ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    H0U Interior trim configuration, cloth, Jet Black 2025–2026 seat trim in cloth, Jet Black; the color and trim pages print it for 1WT and 1LT (with a footnote mark on the WT and LT page: not available with APL passenger seat delete); the Silverado HD (T1XX) doc reads it "cloth, level 2, Jet Black" from its 2023 Upfitter list ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.121 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.118 confirmed
    H2Q Interior trim configuration, vinyl, Dark Ash seats with Jet Black interior accents 2025–2026 1WT with seat codes AE7 and A52 (vinyl) ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.116 confirmed
    H2R Interior trim configuration, cloth, Dark Ash seats with Jet Black interior accents 2025–2026 1WT with seat codes AE7 and A52 (cloth) ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.116 confirmed
    H2S Interior trim configuration, cloth, Dark Ash seats with Jet Black interior accents 2025–2026 1LT with seat codes A52 and A95 (cloth) ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.119 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.116 confirmed

    Internal / Process

    Code Description Years Models/Notes Confidence
    5D4 Aerial work platform vocational package calibration 2025–2026 internal code calibrations for a chassis upfitted with an aerial lift, bucket or boom lift ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    8X8 Label, fasten seat belts 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    KBK Transmission shift control calibration, fuel sense performance 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    N4C Emissions, 50 state certification 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    N4E Emissions, USA 50 state certified 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    SFW Back-up alarm calibration 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    SWA Ship through, produced at Springfield Assembly and shipped to M.H. Eby, West Jefferson, OH, and returned to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TCG Multiple handling charge, Truck Specialty Center to Reading Equipment, Pontiac, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TCI Multiple handling charge, Truck Specialty Center to Monroe Truck Equipment, Flint, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TFG Multiple handling charge, Truck Specialty Center to Auto Truck, Roanoke, IN and return to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    TVY Ship through, produced and shipped to Anchorage VDC then to TK Services and returned to Anchorage VDC for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VAF Ship through, produced at Springfield Assembly and shipped to Fontaine Modification, Springfield, OH and returned to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VCT Ship through, produced in Springfield Assembly and shipped to Knapheide, Flint, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VCU Ship through, produced in Springfield Assembly and shipped to Reading Equipment, Pontiac, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VG7 Label information, clean idle, optional door location 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VGH Ship through, produced in Springfield Assembly and shipped to Kaffenbarger Truck Equipment, New Carlisle, OH, and return to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VNG Ship through, produced in Springfield Assembly and shipped to Monroe Truck Equipment, Flint, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VVZ Multiple handling charge, Truck Specialty Center to Knapheide, Flint, MI and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VWG Ship through, produced in Springfield Assembly and shipped to Auto Truck, Roanoke, IN and return to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    VZW Ship through, produced at Springfield Assembly and shipped to Action Truck and Body, Louisville, KY, and returned to Springfield Assembly for shipping to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed
    WU2 Ship through, produced at Springfield Assembly and shipped to TSC (Truck Specialty Center), Springfield, OH, and returned to Springfield Assembly for shipment to final destination 2025–2026 internal code ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 · 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1 confirmed

    Sources

    Factory documents (T1)

    • chevrolet/2025-chevrolet-silverado-4500-hd-5500-hd-and-6500-hd-fleet-order-guide-rpo-codes.txt — 2025 Chevrolet Silverado 4500 HD, 5500 HD and 6500 HD — GM Fleet Order Guide, RPO Codes
    • chevrolet/2026-chevrolet-silverado-4500-hd-5500-hd-and-6500-hd-fleet-order-guide-rpo-codes.txt — 2026 Chevrolet Silverado 4500 HD, 5500 HD and 6500 HD — GM Fleet Order Guide, RPO Codes
    • chevrolet/2025-chevrolet-silverado-4500-hd-5500-hd-and-6500-hd-fleet-order-guide.txt — 2025 Chevrolet Silverado 4500 HD, 5500 HD and 6500 HD — GM Fleet Order Guide (Print All): page-1 trim groups, COLOR AND TRIM pages, key page (6E2, 5HP)
    • chevrolet/2026-chevrolet-silverado-4500-hd-5500-hd-and-6500-hd-fleet-order-guide.txt — 2026 Chevrolet Silverado 4500 HD, 5500 HD and 6500 HD — GM Fleet Order Guide (Print All): page-1 trim groups, COLOR AND TRIM pages, key page (6E2, 6E8)

    Other sources

    • docs/reference/nicb/nicb2019-gm.txt pp.166 and 180, docs/reference/nicb/nicb2022-gm.txt pp.155 and 170, docs/reference/nicb/nicb2026-gm.txt pp.142 and 160 — NICB VIN manuals (Silverado Medium Duty: GM515 conventional SFA 4x2 and 4x4, series KH and KJ, engine type PV)
    • The merged Silverado HD (T1XX) doc (docs/rpo/chevrolet/silverado-hd-t1xx.md) was read for shared-code wording only; no web pages were fetched for this doc.