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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. Dead battery...2020 L5P 1 2 3

    By Revspan,
    • 41 replies
    • 41.2k views

  2. Transparent trailer won't calibrate 1 2 3

    By Topath,
    • 41 replies
    • 19.1k views

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

    By BuckWallace,
    • 40 replies
    • 12.6k views

  4. Any 2020 models pulling left? 1 2 3

    By KC Desert,
    • 40 replies
    • 24.1k views

  5. key fob transmitter faulty? 1 2 3

    By FirstAscent,
    • 39 replies
    • 46.4k views

  6. Rear end clunk on AT4 HD 1 2 3

    By souper,
    • 39 replies
    • 13.7k views

  7. Infotainment update 1 2 3

    By Beach0433,
    • 39 replies
    • 9.8k views

  8. Abnormally rough ride 1 2 3

    By reb0957,
    • 37 replies
    • 18.6k views

  9. Low Oil Message 1 2 3

    By bigman32hockey,
    • 36 replies
    • 40.5k views

  10. 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

  11. Adaptative cruise control 1 2 3

    By Homer1959,
    • 36 replies
    • 2.8k views

  12. Transmission Dipstick...? 1 2 3

    By THE YETI,
    • 35 replies
    • 177.2k views

  13. 6L90E (gas truck) 2-1 downshift CLUNK 1 2 3

    By Epsilon Plus,
    • 35 replies
    • 21.2k views

  14. 4WD Engagement / Break-In - First Time Owner, Education Needed 1 2 3

    By SoCal Angler,
    • 32 replies
    • 4.4k views

  15. B&W Tow and Stow for Multi-Pro Tailgate - Will it Hit Inner Tailgate? 1 2 3

    By SoCal Angler,
    • 31 replies
    • 12.2k views

  16. Rear differential level on 2024 3500 L8T 1 2 3

    By 64BAwagon,
    • 31 replies
    • 6.2k views

  17. 5th wheel chucking 1 2 3

    By Meade2024,
    • 31 replies
    • 5.2k views

  18. How to determine if new truck is being built 1 2 3

    By dquest,
    • 30 replies
    • 10k views

  19. Infotainment Audio Issues 1 2 3

    By kf9yr,
    • 30 replies
    • 29.5k views

  20. Cold Start Whining Horn Like Noise Comes and Goes? -with video/sound clip 1 2 3

    By Group_er,
    • 30 replies
    • 17.8k views

  21. Poor fuel mileage on 2024 Duramax 1 2 3

    By MesaRat,
    • 30 replies
    • 48.7k views

  22. Whistling sound from drivers side at 45mph or greater 1 2

    By GMC4Zee,
    • 29 replies
    • 7.9k views

  23. 2021 GMC Sierra 2500 Denali HD Tow Mirror - Issues 1 2

    By 2021GMCLP5,
    • 29 replies
    • 20.7k views

  24. 2023 Chevy Silverado 2500HD clunk 1 2

    By Just Mike,
    • 29 replies
    • 11.7k views

  25. Rear leaf spring clunk gone with TSB 21-na-138 fix 1 2

    By Pryme,
    • 28 replies
    • 10.6k views

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