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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.

    8.8k
    posts

  2. Modifications & Accessories

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

    11k
    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.

    5.6k
    posts

1,791 topics in this forum

  1. 12V power to truck bed

    By AndrewF,
    • 11 replies
    • 4.4k views

  2. Dealer patched rear outer tire. Now I got bite marks in the barrel of my 18" polished aluminum rims

    By crazydane,
    • 8 replies
    • 1.4k views

  3. Electrical/Headlight Issues After Delete

    By 73556085455,
    • 5 replies
    • 1.5k views

  4. 2024 2500 AT4x/Denali jump seat conversion

    By Knoxdweller22,
    • 2 replies
    • 1.1k views

  5. LT/LTZ Grille Replacement?

    By Skeld,
    • 3 replies
    • 1.4k views

  6. 2024 AT4 Tailgate Removal + 360 Camera (tldr it works post removal)

    By OkieDavid,
    • 13 replies
    • 18.8k views

  7. Scan tool 1 2

    By Lpfm1990,
    • 21 replies
    • 6.3k views

  8. Doug owner

    By Jasman,
    • 1 reply
    • 656 views

  9. What Triggers "Check Trailer Wiring" DIC Message 1 2 3

    By Wxman,
    • 39 replies
    • 125.5k views

  10. Help finding a part number

    By smokeyburnout,
    • 4 replies
    • 622 views

  11. 2024 GMC DENALI SIERRA ULTIMATE

    By Hobuck2000,
    • 9 replies
    • 9.8k views

  12. 05 6.0 ENGINE NEEDS A TRUCK

    By Eddd,
    • 0 replies
    • 523 views

  13. Price increase on shipping HD trucks

    By 64BAwagon,
    • 13 replies
    • 3.1k views

  14. 2024 Chevy 2500HD Folding Mirror Rattles 1 2

    By davidm767,
    • 25 replies
    • 22.7k views

  15. Just brought it home

    By termite01,
    • 2 replies
    • 1.2k views

  16. Center console mats

    By termite01,
    • 2 replies
    • 955 views

  17. Bad Battery or phantom menace?

    By davidm767,
    • 1 reply
    • 604 views

  18. New ‘25 HD Denali Ultimate or AT4X AEV?

    By paulny,
    • 5 replies
    • 1.8k views

  19. Tire pressures round 2 1 2 3 4

    By rjgvt,
    • 50 replies
    • 15k views

  20. 2020 2500 HD electric parking brake woes and fix

    By digger86,
    • 5 replies
    • 12.1k views

  21. 2024 GMC HD Carplay glitching

    By Sam Avaiusini,
    • 1 reply
    • 942 views

  22. 2500hd gasser 1 2 3 4 9

    By Lpfm1990,
    • 126 replies
    • 12.7k views

  23. 2024 Front center console storage

    By nicholasfrye,   
    • 0 replies
    • 1.1k views

  24. 2023 Allison transmission valve assembly 1 2 3

    By Lars Ohrstrom,
    • 40 replies
    • 26.9k views

  25. Cab lights leaking?

    By Chebbyfan,
    • 7 replies
    • 2.5k views
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