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Troubleshooting, Warranty & Recalls

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

912 topics in this forum

  1. 2024 AT4 Clunk

    By Bstevens1084,
    • 10 replies
    • 2.1k views

  2. Trailer tail lights faintly flashing while parked

    By Mbower2020,
    • 3 replies
    • 2.1k views

  3. Steering Issues

    By Tville,   
    • 2 replies
    • 2.1k views

  4. Click,Click,Click,Click No start.

    By 07HD,
    • 1 reply
    • 2.1k views

  5. Radiator fan always spinning

    By Trailblaster,
    • 2 replies
    • 2.1k views

  6. 2020 DEF tank replacement with Updated re-pin

    By Agez06,
    • 0 replies
    • 2.1k views

  7. IOR Radio USB track information stuck on first track

    By Fred32,
    • 8 replies
    • 2.1k views

  8. New truck need hitch ball for 5th wheel prep

    By GMC4Zee,
    • 6 replies
    • 2.1k views

  9. Operating Temperature

    By bigman32hockey,
    • 1 reply
    • 2.1k views

  10. 2023 2500 High Country trailer plug

    By Jack Horn,
    • 4 replies
    • 2.1k views

  11. Wow, Just Wow

    By ArrowsmithPML,   
    • 1 reply
    • 2k views

  12. The unexpected programing updates during service visit

    By Michael621,
    • 2 replies
    • 2k views

  13. Rear View Mirror Issue

    By Robert Corsentino,
    • 1 reply
    • 2k views

  14. Fender flare light not working no power

    By Cootr68,
    • 0 replies
    • 2k views

  15. sd card infotainment issue, question

    By shadow gray 2020 hd,
    • 5 replies
    • 2k views

  16. Keyless remote activation while in pocket

    By 64BAwagon,
    • 7 replies
    • 2k views

  17. Trailer camera issues - 2020 Denali HD - Bad 7 way connectors? Recall?

    By In2racn,
    • 4 replies
    • 2k views

  18. Service Parking Brake Light on

    By B Hayes,
    • 7 replies
    • 2k views

  19. Trailer lights/ Brake issues 2020 Sierra 2500HD AT4

    By Kyle Mastropasqua,
    • 3 replies
    • 2k views

  20. Mic won’t work for dictation

    By mdunntul,
    • 1 reply
    • 2k views

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

    By Sunshine39,
    • 11 replies
    • 2k views

  22. GM Issues Service Update For Chevy Silverado HD, GMC Sierra HD Over TCM Calibration (2020 models)

    By iflypigs,
    • 0 replies
    • 2k views

  23. Exhaust Brake concerns

    By DBaker,
    • 4 replies
    • 2k views

  24. Anyone think theres a chance of GM updating the gauges to something usable ? 1 2

    By 64BAwagon,
    • 15 replies
    • 1.9k views

  25. 2020 Silverado HD Seems to have forgotten it has a tailgate.

    By Jwisco,
    • 5 replies
    • 1.9k views
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