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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. Hill Start Assist Sensor Adjustment?

    By AndrewF,
    • 2 replies
    • 745 views

  2. Finally have my truck.... 1 2

    By Gary2500LTZ,
    • 17 replies
    • 1.6k views

  3. Trailer Profile Light or Heavy Trailer

    By Higginsc41,
    • 7 replies
    • 1.4k views

  4. Seats

    By James Beyer,
    • 6 replies
    • 1.6k views

  5. New Truck!

    By 2k19Sierra,
    • 4 replies
    • 1.1k views

  6. What is going on in Flint???

    By Gary2500LTZ,
    • 4 replies
    • 1.1k views

  7. Cabin air filter

    By rjgvt,
    • 10 replies
    • 10.5k views

  8. 2020 Gmc 2500HD Engine buzzing on acceleration

    By SKel,
    • 3 replies
    • 981 views

  9. .

    By 64BAwagon,
    • 12 replies
    • 1.3k views

  10. Ordered a 2025 and now waiting 1 2 3 4

    By xrichard,
    • 52 replies
    • 22.4k views

  11. 2024 GMC Sierra 3500 HD

    By john kari,
    • 4 replies
    • 1.3k views

  12. 2024 GMC HD Carplay glitching

    By Sam Avaiusini,
    • 2 replies
    • 1.3k views

  13. 2020 GMC AT4 Diesel Brakes lock up on their own. Extremely Dangerous!!! 1 2 3

    By joeidaho,
    • 42 replies
    • 30.9k views

  14. Passing on some info about second battery option. 1 2 3 4

    By 64BAwagon,
    • 48 replies
    • 25.1k views

  15. 22 2500hd gas

    By 22 6.6gasser,
    • 9 replies
    • 1k views

  16. 2022 tapping near oil pan after oil change

    By 22 6.6gasser,   
    • 0 replies
    • 858 views

  17. 2024 gmc 2500hd 6.6 gas intermittent p0458 Evap Control Valve "A" Circuit Low

    By Ausslo,
    • 5 replies
    • 3.1k views

  18. 2025 GMC 2500HD Duramax code U1962

    By DBaker,
    • 1 reply
    • 2.5k views

  19. 12V power to truck bed

    By AndrewF,
    • 11 replies
    • 3.8k views

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

    By crazydane,
    • 8 replies
    • 1.3k views

  21. Electrical/Headlight Issues After Delete

    By 73556085455,
    • 5 replies
    • 1.4k views

  22. 2024 2500 AT4x/Denali jump seat conversion

    By Knoxdweller22,
    • 2 replies
    • 1k views

  23. LT/LTZ Grille Replacement?

    By Skeld,
    • 3 replies
    • 1.3k views

  24. 2024 AT4 Tailgate Removal + 360 Camera (tldr it works post removal)

    By OkieDavid,
    • 13 replies
    • 18.3k views

  25. Scan tool 1 2

    By Lpfm1990,
    • 21 replies
    • 5.7k views
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