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 2500:

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

Get free help with your lemon!
close ad
problem #1

Feb 092022

Sierra 2500

  • miles
DEF tank system failure. Vehicle is under warranty, 18 months old, (purchased 08/20) with 20,000 miles. 6 WEEKS AGO I took to dealer who informed me that there are no DEF tanks available and don't know when they will be available. This is a hazard: if I am on a trip and the system shuts off I could be stranded anywhere with the reduced speed that the DEF system creates. If this system is designed to shut off (with warning) there should be ample supplies at all GMC dealers for repair. If there aren't ample supplies the system should NOT shut the truck down. THIS IS A SAFETY HAZARD THAT IS PREVENTABLE!

- Tafton, PA, USA