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Troubleshooting, Warranty & Recalls

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

919 topics in this forum

  1. Parking lights

    By Cameron morse,
    • 0 replies
    • 859 views

  2. Outside air temp reading won't update

    By CRApex,
    • 3 replies
    • 1.2k views

  3. 2020 2500 HD Recall - Seatbelt Pretensioner Fire

    By cNate,
    • 4 replies
    • 1.5k views

  4. low engine temperature? 1 2

    By bass mechanic,
    • 21 replies
    • 19.3k views

  5. Receiving text messages 1 2

    By The Bopper,
    • 23 replies
    • 12.7k views

  6. Looks like I have similar problem with iPhone and the navigation system that the 1/2 tons have.

    By Sunshine39,
    • 11 replies
    • 2k views

  7. Multi gate tailgates..........functional but kinda feel cheap

    By Peekaboo Bruizer,
    • 1 reply
    • 812 views

  8. 2020 Sierra 2500HD Denali POS

    By Kuhns07,
    • 2 replies
    • 4k views

  9. TPMS lost a sensor then it magically came back miles later...

    By KC Desert,
    • 3 replies
    • 940 views

  10. Vibration

    By fonz46,
    • 1 reply
    • 2.2k views

  11. Blowig 15A park lamp RT fuse

    By jl449,
    • 6 replies
    • 8.5k views

  12. Condensation in camera

    By Irish80,
    • 11 replies
    • 1.4k views

  13. 2020 2500 & 3500HD Coolant Bypass Line Leak

    By blk04sr,
    • 0 replies
    • 1k views

  14. Dome lights staying on

    By Ernest Grigsby,
    • 1 reply
    • 754 views

  15. Tailgate switch operation?

    By Irish80,
    • 9 replies
    • 8.8k views

  16. If you are in camera view, is there a way to get out of it

    By Sunshine39,
    • 8 replies
    • 1.6k views

  17. Park assist in 2020

    By The Bopper,
    • 3 replies
    • 1.9k views

  18. Limited availability of 2020 ProGrade Trailering System

    By Say When,
    • 9 replies
    • 4.1k views

  19. Sunglass holder

    By The Bopper,
    • 9 replies
    • 4.6k views
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