10.0

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
0 miles

About These NHTSA Complaints:

The NHTSA is the US gov't agency tasked with vehicle safety. Complaints can be spread across multiple & redundant categories, & are not organized by problem. See the Back button — blue bar at the very top of the page — to explore more.

Get notified about new defects, investigations, recalls & lawsuits for the 2020 GMC Sierra 3500:

Unsubscribe any time. We don't sell/share your email.

Get free help with your lemon!
close ad
problem #3

Jan 152023

Sierra 3500

  • miles
Rear tires locking up out of no where almost made me jack knife.

- Dalbo, MN, USA

Add Complaint
problem #2

Sep 122022

Sierra 3500

  • miles
The exhaust system is directed to the rear of the vehicle and when towing causes extreme heat to build on the item being towed, in my case a 5th wheel camper. The heat has melted the trim on my camper and is a potential fire hazard.

- The Villages, FL, USA

Add Complaint
problem #1

May 012020

Sierra 3500 4WD 8-cyl Diesel

  • Automatic transmission
  • miles
The computer lite up the dash and reduced power, plus took the trailer brakes off line. This happened while loaded. To reset the system you have to pull over and turn the vehicle off. This happens 2-3 times per day. This was a problem at 600 miles. The transmission shifted from 10 gear to 5th gear while driving 75 miles per hour. The truck had 75,000 miles on it. Had to send another truck out to pick up the load in Santa Rosa New Mexico. The dealer Glenn Polk in Sanger has been working on for the last 4 months There is never a warning until the lights come on with a system failure.

- Irving, TX, USA

Add Complaint