Troubleshooting, Warranty & Recalls

3,465 topics in this forum

1. 2020 RST Silverado 1500 3.0 L Wiring diagrams

   By chris 00416, November 19, 2020
   • 1 reply
   • 4.9k views
   • 
   • davester
   • November 20, 2020

2. 2020 RST Z71 starting and then dying

   By bradleymichael, November 2, 2020
   • 2 replies
   • 7.4k views
   • 
   • Beermister
   • March 16, 2021

3. 2020 Sierra - Rear brake piston fully extended and unable to retract it.

   By ajs800, August 25, 2023
   • 9 replies
   • 16.7k views
   • 
   • silveradosid
   • October 2, 2024

4. 2020 Sierra - Various Mechanical/electrical/digital problems (Mirror vibe, locks, navi, seats, rear park assist)

   By aragrev7, June 22, 2020
   • 11 replies
   • 6.1k views
   • 
   • aragrev7
   • August 19, 2020

5. 2020 Sierra 1500 6.2L shudder....

   By shadysneed, March 13, 2021
   • 3 replies
   • 4.2k views
   • 
   • Sam321
   • April 1, 2021

6. 2020 Sierra 1500 AT4 / 7 pin trailer connector truck side.

   By Garett Dixon, November 8, 2019   

   • 7 pin
   • Trailer
   • (and 1 more)

     Tagged with:

     • 7 pin
     • Trailer
     • Connector truck side
   • 3 replies
   • 7.4k views
   • 
   • Garett Dixon
   • November 8, 2019

7. 2020 Sierra 1500 dead battery

   By snyderfarms, July 29, 2020
   • 6 replies
   • 2.8k views
   • 
   • snyderfarms
   • July 30, 2020

8. 2020 Sierra 1500 Jerks After Full Stop

   By adionline, August 4, 2021
   • 2 replies
   • 2.6k views
   • 
   • 20L8TSierra24
   • August 5, 2021

9. 2020 Sierra 1500 Tailgate Won't Open After Removal and Reinstall

   By brulosopher, September 2, 2021   

   • help
   • tailgate
   • 0 replies
   • 3k views
   • 
   • brulosopher
   • September 2, 2021

10. 2020 Sierra 1500 Wheel Stud

    By Dmatt88, September 16, 2021
    • 1 reply
    • 680 views
    • 
    • 19 Denali ultimate
    • September 16, 2021

11. 2020 Sierra 2.7 litre reliability

    By Mike Laing, June 12, 2020
    • 0 replies
    • 1.4k views
    • 
    • Mike Laing
    • June 12, 2020

12. 2020 Sierra 3500 srw. Won't go into 4l

    By Bobnlee1, January 17, 2024
    • 0 replies
    • 366 views
    • 
    • Bobnlee1
    • January 17, 2024

13. 2020 Sierra 3500 srw. Won't go into 4l

    By Bobnlee1, January 17, 2024
    • 4 replies
    • 1.5k views
    • 
    • Bobnlee1
    • January 20, 2024

14. 2020 Sierra 6.2L, 500 miles on odometer, broke down 4 weeks ago. Engine is toast.

    By GMCnoob, December 12, 2020
    • 7 replies
    • 2.8k views
    • 
    • newdude
    • December 14, 2020

15. 2020 Sierra AC outlet, open ground

    By Coastie, April 10, 2020
    • 2 replies
    • 2.7k views
    • 
    • Coastie
    • April 11, 2020

16. 2020 Sierra Denali 1500 Bumper Gap

    By 20sierradenali, October 20, 2020
    • 0 replies
    • 810 views
    • 
    • 20sierradenali
    • October 20, 2020

17. 2020 Sierra Denali 1500, Brand New, No Audio from speakers (intermittent)

    By GMCnoob, September 22, 2020
    • 2 replies
    • 2.3k views
    • 
    • DarkSky20
    • September 27, 2020

18. 2020 Sierra Elevation Body Panel Gaps

    By Ajt116, September 17, 2020
    • 1 reply
    • 1.1k views
    • 
    • Ajt116
    • September 17, 2020

19. 2020 Sierra heated/cooled seats not working

    By Bradley20, December 14, 2024
    • 7 replies
    • 3.1k views
    • 
    • Bradley20
    • December 16, 2024

20. 2020 Sierra Infotainment Screen Won't Load - Frozen on GMC logo during startup

    By roccod787, May 10, 2023   

    • Radio Screen
    • infotainment screen
    • (and 3 more)

      Tagged with:

      • Radio Screen
      • infotainment screen
      • Frozen Radio
      • battery replacement issue
      • radio issue
    • 2 replies
    • 3k views
    • 
    • repairman54
    • May 12, 2023

21. 2020 Sierra nav screen access

    By Melkc, November 8, 2019
    • 2 replies
    • 520 views
    • 
    • 2016 Sierra Owner
    • November 11, 2019

22. 2020 sierra no power going to auto dimming rear view mirror, is there a fuse?

    By wavjumpr1, June 20, 2021
    • 1 reply
    • 2k views
    • 
    • Mcclure53
    • August 27, 2021

23. 2020 Sierra Rear Brakes Issue, Inside Pad Bad Outside Still Good

    By alvarezz09, June 21, 2024   

    • brakes
    • pads
    • 4 replies
    • 4.8k views
    • 
    • silveradosid
    • June 29, 2024

24. 2020 Sierra Sliding Rear Glass Only Replacement

    By MacPH, May 11, 2023
    • 0 replies
    • 416 views
    • 
    • MacPH
    • May 11, 2023

25. 2020 Sierra SLT A/C noise

    By Sierra20-20, June 19, 2020
    • 8 replies
    • 11.3k views
    • 
    • Nestor Romero
    • April 17, 2022