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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. Blind side warning

    By Kittybork,
    • 3 replies
    • 975 views

  2. Blind Spot Monitoring w/Trailer

    By Skeld,
    • 3 replies
    • 5.1k views

  3. Blowig 15A park lamp RT fuse

    By jl449,
    • 6 replies
    • 8.4k views

  4. Bluetooth crackling/static after Y172 update 1 2 3

    By BuckWallace,
    • 40 replies
    • 12.7k views

  5. Bluetooth disconnect and phone call crackling on 2025 GMC Sierra

    By Bob Sales,
    • 2 replies
    • 1.7k views

  6. Bluetooth iPhone Issues

    By YF26Dmax,
    • 7 replies
    • 6.5k views

  7. Boat trailer running lights won't work on new GMC AT4HD

    By cjacksonlasd,
    • 3 replies
    • 944 views

  8. Body repair questions

    By Edmond,
    • 3 replies
    • 850 views

  9. Bose Sub only works when it wants to?

    By aliveguy5,
    • 1 reply
    • 961 views

  10. Bottom Radiator Shroud / Scoop / Cover Removal?

    By Tomato,
    • 0 replies
    • 1.1k views

  11. Brake Controller / Dexter EOH Actuator Does not Work / Glitchy

    By jjackkrash,
    • 4 replies
    • 8.2k views

  12. Brake Controller:

    By Tucson Jack,
    • 9 replies
    • 22.7k views

  13. Brake Fluid Bleeding....Vacuum vs Pressure?

    By SoCal Angler,
    • 12 replies
    • 3k views

  14. Brake Noise

    By kylant,
    • 4 replies
    • 12.2k views

  15. Brake oil leak

    By rad21,
    • 1 reply
    • 693 views

  16. Brake Pad Life System not updating after front NEW brakes, rotor and sensor

    By Ranger473,
    • 8 replies
    • 24.2k views

  17. Brake Pad Wear Reset problem

    By MikeMikeMike,
    • 6 replies
    • 9.8k views

  18. Brake pedal hard to push 1 2 3 4

    By gerald compton,
    • 57 replies
    • 37.4k views

  19. Brake Squeak 21’ Sierra 2500

    By Jack Aldridge,
    • 4 replies
    • 2.2k views

  20. Brake Squeal Still there

    By DonYukon,
    • 2 replies
    • 1.1k views

  21. Brakes Squeaking @ 10K 1 2 3 4 7

    By LarryM,
    • 98 replies
    • 60.6k views

  22. Brand new 2022 Sierra 2500 AT4 with bad alignment

    By ForestAT4,
    • 7 replies
    • 3.4k views

  23. Brand new and puked oil 1 2

    By Chrisbert,
    • 17 replies
    • 2.7k views

  24. Brand New truck did not pass CA smog

    By kylant,
    • 13 replies
    • 12.6k views

  25. Build sticker location? Not in glovebox...

    By ROOK Lucky 13,
    • 6 replies
    • 2.8k views
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