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

Dec 142022

Sierra 3500

  • miles
Rear window leaking on 2020 gmc truck due to faulty rear window seal and plastic slide. Known issue in 2020 models with a service bulletin already in place. Headliner saturated and black mold showing. Rear back liner has been saturated multiple times and gmc would not refund the cost of a whole new window to be put in and reimbursed. GM bulletin # is 18-NA-383

- Ramona, CA, USA

problem #1

Nov 132022

Sierra 3500

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

- Lawton, OK, USA