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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. Doug owner

    By Jasman,
    • 1 reply
    • 626 views

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

    By Wxman,
    • 39 replies
    • 123k views

  3. Help finding a part number

    By smokeyburnout,
    • 4 replies
    • 583 views

  4. 2024 GMC DENALI SIERRA ULTIMATE

    By Hobuck2000,
    • 9 replies
    • 9.6k views

  5. 05 6.0 ENGINE NEEDS A TRUCK

    By Eddd,
    • 0 replies
    • 508 views

  6. Price increase on shipping HD trucks

    By 64BAwagon,
    • 13 replies
    • 3k views

  7. 2024 Chevy 2500HD Folding Mirror Rattles 1 2

    By davidm767,
    • 25 replies
    • 21.9k views

  8. Just brought it home

    By termite01,
    • 2 replies
    • 1.1k views

  9. Center console mats

    By termite01,
    • 2 replies
    • 878 views

  10. Bad Battery or phantom menace?

    By davidm767,
    • 1 reply
    • 570 views

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

    By paulny,
    • 5 replies
    • 1.8k views

  12. Tire pressures round 2 1 2 3 4

    By rjgvt,
    • 50 replies
    • 13.8k views

  13. 2020 2500 HD electric parking brake woes and fix

    By digger86,
    • 5 replies
    • 10.7k views

  14. 2024 GMC HD Carplay glitching

    By Sam Avaiusini,
    • 1 reply
    • 913 views

  15. 2500hd gasser 1 2 3 4 9

    By Lpfm1990,
    • 126 replies
    • 12.2k views

  16. 2024 Front center console storage

    By nicholasfrye,   
    • 0 replies
    • 1k views

  17. 2023 Allison transmission valve assembly 1 2 3

    By Lars Ohrstrom,
    • 40 replies
    • 26.1k views

  18. Cab lights leaking?

    By Chebbyfan,
    • 7 replies
    • 2.2k views

  19. Moving/adding center stack switches '22 2500HD

    By Nodakrider,
    • 1 reply
    • 992 views

  20. Suspension Torque Specs - Cognito Leveling Kit

    By VermontL5P,
    • 3 replies
    • 1.4k views

  21. 2022 GMC Sierra 1500 and others BCM footwell lighting pinout - Denali Doorsill Install Info 1 2 3 4 6

    By matt99199,
    • 84 replies
    • 52.7k views

  22. 220 amp alternator 1 2

    By Chebbyfan,
    • 22 replies
    • 5.6k views

  23. Order time 1 2

    By 64BAwagon,
    • 22 replies
    • 2k views
    • Z45
    • Z45

  24. Headlight Control In Campgrounds

    By jake111,
    • 5 replies
    • 1.1k views

  25. Is this a new technique for criminals to gain access to interior of new trucks? 1 2

    By tonto340,
    • 19 replies
    • 3.6k views
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