Troubleshooting, Warranty & Recalls

910 topics in this forum

1. '24 needs a new turbo

   By madweazl, May 8, 2024
   • 1 reply
   • 998 views
   • 
   • Capt Bob
   • May 8, 2024

2. '24 upper glove box sticking

   By madweazl, May 16, 2023
   • 5 replies
   • 9.5k views
   • 
   • madweazl
   • November 15, 2023

3. "please supply password to continue to use connected services" Does anyone know if this is onstar or something else?

   By GMC4Zee, May 29, 2023
   • 5 replies
   • 1.8k views
   • 
   • shadow gray 2020 hd
   • June 3, 2023

4. "Pro Trailering" missing from MY-GMC app

   By In2racn, August 29, 2022
   • 3 replies
   • 1.7k views
   • 
   • Crazy Canuck
   • September 13, 2022

5. "Reduced Engine Power" - P228C

   By Marshy, February 27, 2025
   • 4 replies
   • 6.8k views
   • 
   • Marshy
   • February 28, 2025

6. "Side Detection Temporarily unavailable"

   By Makito, November 17, 2020
   • 1 reply
   • 3.6k views
   • 
   • mkeddie161
   • November 17, 2020

7. 10L1000 Assembly Lube?

   By Armgrim, September 19, 2021
   • 2 replies
   • 944 views
   • 
   • Armgrim
   • September 20, 2021

8. 2 Odd Noises When Driving Off-Road

   By Muleytime, January 6, 2020
   • 4 replies
   • 3.1k views
   • 
   • Christopher Murphy
   • January 9, 2020

9. 2020 2500 & 3500HD Coolant Bypass Line Leak

   By blk04sr, October 11, 2019
   • 0 replies
   • 994 views
   • 
   • blk04sr
   • October 11, 2019

10. 2020 2500 AT4 Diesel Fuel Economy after fill up

    By Joeroberts362, December 13, 2020   

    • at4
    • 6.6L Duramax
    • (and 1 more)

      Tagged with:

      • at4
      • 6.6L Duramax
      • fuel
    • 0 replies
    • 7.5k views
    • 
    • Joeroberts362
    • December 13, 2020

11. 2020 2500 duramax ac drain line location

    By bmpiper55, November 4, 2024
    • 0 replies
    • 496 views
    • 
    • bmpiper55
    • November 4, 2024

12. 2020 2500 gas

    By Brandon05, August 30, 2020
    • 3 replies
    • 1.4k views
    • 
    • CRApex
    • August 30, 2020

13. 2020 2500 HD Recall - Seatbelt Pretensioner Fire

    By cNate, November 19, 2019
    • 4 replies
    • 1.5k views
    • 
    • sdelam
    • December 7, 2019

14. 2020 2500 HD Sierra No Audio!!!

    By H.B. Shannon, June 14, 2020
    • 7 replies
    • 1.8k views
    • 
    • LSPowered65
    • June 28, 2020

15. 2020 2500 SLT DEAD 1 2

    By DNHMIKE, September 14, 2020
    • 22 replies
    • 3.5k views
    • 
    • MTU Alum
    • September 25, 2020

16. 2020 2500HD 4x4 help please!!

    By Bones454, May 7, 2020
    • 7 replies
    • 4.8k views
    • 
    • Dunn
    • May 9, 2020

17. 2020 2500HD AT4 trans case leak and Stranded

    By Kaamacat, September 15, 2021
    • 0 replies
    • 752 views
    • 
    • Kaamacat
    • September 15, 2021

18. 2020 2500HD camera issues

    By honda65, March 13, 2021
    • 1 reply
    • 1.2k views
    • 
    • powderMonkey
    • March 14, 2021

19. 2020 2500HD Duramax crackling on idle

    By Newduramaxh*ar, June 29, 2020
    • 3 replies
    • 2.2k views
    • 
    • Tomato
    • June 30, 2020

20. 2020 2500HD Fuel Filler Door Spring

    By Mketch.918, January 9, 2021
    • 0 replies
    • 2.3k views
    • 
    • Mketch.918
    • January 9, 2021

21. 2020 2500hd high country door latch noisy 1 2 3 4

    By Paul jackckson, December 15, 2020
    • 53 replies
    • 27k views
    • 
    • Lew2024denali3500
    • December 6, 2024

22. 2020 2500HD L5P no communications with modules

    By rdomeck, August 24, 2024
    • 3 replies
    • 3.1k views
    • 
    • asilverblazer
    • August 26, 2024

23. 2020 2500HD LT running lights

    By Greg Nelson, December 26, 2023
    • 2 replies
    • 2.7k views
    • 
    • carkhz316
    • December 29, 2023

24. 2020 2500HD not starting

    By Reiss' Pieces NY, May 28, 2020
    • 2 replies
    • 1.2k views
    • 
    • Stand By
    • May 29, 2020

25. 2020 2500hd program and add a key fob

    By Maninthesea, June 10, 2021
    • 3 replies
    • 8.1k views
    • 
    • Another JR
    • December 14, 2021