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Troubleshooting, Warranty & Recalls

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

910 topics in this forum

  1. 3.0 Duramax cranks but won’t start 1 2 3 4 35

    By Dbersuch,
    • 510 replies
    • 187.5k views

  2. Transmission Dipstick...? 1 2 3

    By THE YETI,
    • 35 replies
    • 177.2k views

  3. Tailgate spontaneously opening 1 2 3 4 13

    By jsward12,
    • 191 replies
    • 121.7k views

  4. Trailer lights 1 2 3 4 5

    By Jordan94,   
    • 64 replies
    • 106.8k views

  5. 2024 Brake controller Problems 1 2 3 4 16

    By Curt Lowe,
    • 229 replies
    • 104.9k views

  6. 2020 6.6 Liter Gas Engine Problems 1 2

    By Bill Shaffer,   
    • 23 replies
    • 102.4k views

  7. Power Tailgate Won’t Open 1 2

    By BruceP,   
    • 15 replies
    • 95.4k views

  8. Noisy steering column 1 2 3 4 8

    By STGS,
    • 108 replies
    • 88.9k views
    • Snlk
    • Snlk

  9. grease fittings 1 2 3 4

    By Bigbucks10,
    • 53 replies
    • 87.1k views

  10. Engine knock a 500 miles 1 2 3 4 10

    By bass mechanic,
    • 135 replies
    • 73.6k views

  11. Fuel filter reset

    By Irish80,
    • 10 replies
    • 62k views

  12. 2020 GMC AT4 - Won't start, won't even attempt to turn over 1 2 3

    By CO 2020 GMC AT4,
    • 36 replies
    • 60.5k views

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

    By LarryM,
    • 98 replies
    • 60.5k views

  14. Changing to neutral with dead battery

    By DMcKinney,
    • 11 replies
    • 58.6k views

  15. 2020 2500HD Transmission issues 1 2 3 4

    By gpraceworks,
    • 45 replies
    • 57.6k views

  16. Trailer TPMS sensors loose signal 1 2 3 4 7

    By Andrew Best,   
    • 96 replies
    • 56.2k views

  17. Rear Window Leak and GM warranty warning 1 2

    By bowtie2007,
    • 28 replies
    • 55.9k views

  18. 2024 Turn Signals Not Working Properly at Times 1 2 3 4 7

    By jd64,
    • 99 replies
    • 55k views

  19. New Infotainment System Update v148 / Radio won't shut off issue 1 2

    By SkidooSteve12,
    • 16 replies
    • 54.7k views

  20. Service Steering Column Lock 1 2

    By Tville,   
    • 25 replies
    • 54.5k views

  21. No Trailer Connected Issue 1 2

    By Leon Baehre,
    • 22 replies
    • 54.3k views

  22. Highway speed vibration on 2020? 1 2 3 4 6

    By Ckhris,
    • 77 replies
    • 51.9k views

  23. Poor fuel mileage on 2024 Duramax 1 2 3

    By MesaRat,
    • 30 replies
    • 48.7k views

  24. active aero shutters 1 2 3 4 5

    By H1ghlndr,
    • 67 replies
    • 46.6k views

  25. Wheel lugnut torque

    By GMC4Zee,
    • 4 replies
    • 46.5k views

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