10.0

really awful
Crashes / Fires:
0 / 1
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 #2

Nov 132022

Sierra 3500

  • miles
Plugged in engine block heater and the car erupted in flames. Total loss.

- Lawton, OK, USA

problem #1

Jul 072020

Sierra 3500 4WD 8-cyl Diesel

  • Automatic transmission
  • miles
The computer lights up the dash reducing power and turning off power to trailer brakes. This has almost caused an accident on several occasions. It happens a couple of times per trips. This vehicle has been in the shop a couple of times per month since it was put into service. Glenn Polk Chevrolet has worked on it each time and the problem is still there. This truck has also had several injector issues. There is an open case with this vehicle with General Motors with no resolution. I have filled out forms on each of my 2020 GMC's 3500's.

- Irving, TX, USA