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2020-2026 Silverado HD & Sierra HD

The heavy-duty headquarters. Discussion for the 2500HD and 3500HD. Towing, payload, ordering, and daily driving.

 

 

Subforums

  1. Troubleshooting, Warranty & Recalls

    The repair shop. Diagnose emissions codes, electrical issues, Allison transmission behavior, and recall updates.

    8.7k
    posts

  2. Modifications & Accessories

    Bumper replacements, 5th wheel hitches, auxiliary lighting, and suspension upgrades for your workhorse.

    10.9k
    posts

  3. 6.6L Duramax Diesel (L5P)

    The torque monster. Tuning, maintenance, and exhaust discussion for the L5P Duramax and 10-speed Allison transmission.

    2.2k
    posts

  4. 6.6L Gas V8 (L8T)

    The iron-block workhorse. Tech and reliability discussion for the 6.6L L8T V8 and the 6-speed / 10-speed heavy-duty transmissions.

    5.5k
    posts

1,787 topics in this forum

  1. 2024 Silverado HD Custom parts interchangeability with 2020-2023

    By Ry Guy,
    • 3 replies
    • 2.2k views

  2. Remove SIM Card from 2020 Silverado 3500

    By RGDD,
    • 8 replies
    • 20k views

  3. Rear Bumber swap

    By itismedavidg,
    • 0 replies
    • 604 views

  4. Spare tire ratchet tool

    By Hoginedgewood,
    • 6 replies
    • 4.7k views

  5. Power outlet 1 2

    By Los-0,
    • 26 replies
    • 77.2k views

  6. T1XX Trunnion Bushings

    By revrnd,
    • 7 replies
    • 880 views

  7. 2022 GMC SIERRA 2500 AT4 BRAKE SERVICE MODE

    By joeyjan,
    • 3 replies
    • 1.8k views

  8. 2024 2500HD AT4 engine randomly shutting down

    By 2500HDAT4,
    • 6 replies
    • 5.8k views

  9. 2024 GMC Denali Snow/Ice Mode?

    By SDDenali2024,
    • 5 replies
    • 5.5k views
    • Z45
    • Z45

  10. No RPO Code Sticker on 2024 Models

    By revrnd,
    • 9 replies
    • 6.9k views

  11. GM wheels and center caps

    By rjgvt,
    • 6 replies
    • 12.7k views

  12. Exhaust Brake

    By bharris515,
    • 14 replies
    • 34.2k views
    • Dunn
    • Dunn

  13. New 2024 GMC duramax 2500 (first Diesel and bit terrified tbh)

    By Dunn,
    • 10 replies
    • 3.3k views
    • Dunn
    • Dunn

  14. TMPS sensor for 2024

    By OS RR,
    • 1 reply
    • 580 views

  15. Question about 21-23 off road high clearance steps

    By juliaoakes,
    • 1 reply
    • 896 views

  16. Ordering 2025 GMC Hd

    By dlockwood26,
    • 3 replies
    • 1.8k views

  17. Seat Covers 1 2

    By rdonarski,
    • 18 replies
    • 14.3k views

  18. 1st 500-miles review - Please let me know if you share any of these issues! 1 2

    By Brianb33,
    • 16 replies
    • 6.2k views
    • Dunn
    • Dunn

  19. Questions on using a Sierra/Silverado to haul a slide in camper 1 2

    By RKCRLR,
    • 26 replies
    • 7.4k views

  20. 2021 Silverado 2500 LT Front License Plate Bracket Removal??

    By ArkChevy,
    • 13 replies
    • 40.4k views

  21. 2025 HD production in Flint

    By 64BAwagon,
    • 9 replies
    • 1.7k views

  22. 2500 HD ZR2 and AT4X owners, which way is your spare tire facing?

    By Red Hawk,
    • 5 replies
    • 3.7k views

  23. L8T 6.6 Gas Oil Consumption At 30K 21' 2500HD

    By Antny,
    • 1 reply
    • 3.6k views

  24. opinions on this car fax report please

    By 94yj,
    • 9 replies
    • 1.2k views

  25. Did the HD brake controller recall fix your brakes?

    By nitro882,
    • 7 replies
    • 3.7k views
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