NHTSA Complaint #11580419 — 2020 GMC SIERRA 1500

STRUCTURE:BODY issue reported to NHTSA

Check any vehicle history by VIN - Free vehicle history report

Complaint Details

ODI Number	11580419
Vehicle	2020 GMC SIERRA 1500
Component	STRUCTURE:BODY
Date of Incident	April 1, 2024
Date Filed	April 1, 2024
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	CO

Consumer Description

GM refuses to fix a known design flaw in the back sliding glass frame on 2020_24 gmc sierra trucks. This issue will generate toxic mold as large quantities of water enter the cabin and can be extremely harmful for certain individuals allergic to mold. GM knows about this issue and tried to secretly advise techs via TSB 18-na-383 to apply sealant on the frame and if customer returns to replace frame. However they do not want to do this outside the 3 year warranty. The back glass on a truck is not a serviceable item.

Related Complaints for the 2020 GMC SIERRA 1500

Other STRUCTURE:BODY Complaints

#11672898 — July 11, 2025 — My multipro tailgate on my 2020 GMC Sierra 1500 unlatched while a trailer was attached and backing up said trailer. T...

#11656171 — April 22, 2025 — Had water leaking into cab of truck. First incident they stated it was a rear window seal and it was "repaired" unde...

#11643561 — February 18, 2025 — Tailgate opened on highway with cargo in bed. Also tailgate opens randomly when parked. This has happened many times,...

#11628811 — December 4, 2024 — Tailgate releases on its own while parked, without the use of the switch. Tailgate released on its own with my traile...

#11586345 — May 1, 2024 — The rear sliding window leaks water inside the cab every time it rains. With water getting into the cab the issue of ...

Recent Complaints for the 2020 GMC SIERRA 1500

#11719463 — ENGINE — February 20, 2026 — The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, there was a l...

#11719518 — FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING — February 20, 2026 — The brakes suddenly activate and cause the vehicle to rapidly stop with no warning of any kind and without any brakin...

#11719423 — POWER TRAIN — February 20, 2026 — On Friday, January 30, 2026 while driving our 2020 GMC Sierra 1500, we experienced sudden loss of power and the motor...

#11719487 — POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER — February 20, 2026 — The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle u...

#11719518 — SERVICE BRAKES — February 20, 2026 — The brakes suddenly activate and cause the vehicle to rapidly stop with no warning of any kind and without any brakin...