NHTSA Complaint #11576141 — 2021 GMC SIERRA 2500 ELECTRICAL SYSTEM

Complaint Details

ODI Number	11576141
Vehicle	2021 GMC SIERRA 2500
Component	ELECTRICAL SYSTEM
Date of Incident	March 7, 2024
Date Filed	March 8, 2024
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	TX

Consumer Description

The harness that hooks to bumper plug for trailer lighting is not completely water tight. Allows water in and creates buildup that weakens the connection as well as allows the plug wire connection to snap out and push out from the pin. Further inspection it was causing a short in the system. I attempted to clean and put some-electric grease on the plug to help clean it but then relaized 3 pins were broken and pushed back.

Related Complaints for the 2021 GMC SIERRA 2500

Other ELECTRICAL SYSTEM Complaints

#11686699 — September 11, 2025 — When I’m in reverse the up the cameras turn off. On one incident I was backing up and the camera turned off causing m...

#11633825 — January 3, 2025 — Headlights and turn signals failed. Flickering of various lights (Daytime running lamp, low beam, high beam, turn si...

#11627389 — November 26, 2024 — On 11/21/24 noticed passenger headlight day light running light flickering. On 11/22/24 right turn indicator intermit...

#11608733 — August 15, 2024 — Smog system check and Engan warning light keeps come on.

#11570651 — February 7, 2024 — While driving the entire dash cluster (speed,rpm etc) turns off entirely, reloads as if truck is just starting with a...

Recent Complaints for the 2021 GMC SIERRA 2500

#11715295 — ENGINE — February 3, 2026 — 80,000 Miles, complete engine break down. 12,000 to repair

#11709159 — EXTERIOR LIGHTING — January 6, 2026 — My right headlamp/ turn signal assembly began flashing at random intervals. The high beam would come on and off rando...

#11703711 — POWER TRAIN — December 8, 2025 — Pulling into a driveway and the truck made a loud clunk and the check engine light, traction control light, and a red...

#11696338 — POWER TRAIN — October 29, 2025 — The contact owns a 2021 GMC Sierra 2500. The contact stated that while driving at 50 MPH, the contact was pulling a t...

#11692084 — SERVICE BRAKES — October 8, 2025 — 2021 GMC Sierra 2500HD 6.6L gas 6 speed automatic transmission W/4wd After a brake service job the vehicle will rand...