10.0

really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
32,250 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 2012 GMC Sierra:

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

problem #2

Jun 062014

Sierra 8-cyl Diesel

  • 54,500 miles
Pulling into a parking spot in a parking garage going no more than 3 miles per hour, or however fast this vehicle can go while foot is resting on brake, getting ready to fully brake. As I pressed down on brake to stop, the vehicle continued as if the anti-lock brake system slipped, causing the truck to drive forward crashing through the sheetrock wall and finally stopping after hitting the glass windows. Two weeks later, after all cosmetic repairs were done, the vehicle did the same thing in another parking lot, but luckily broke before hitting the curb and light post. I did feel under my foot on the brake peddle, as I pressed down to stop, a slip of some sort which at the same time caused the vehicle to push forward right before stopping. This is definitely a malfunction of some sort with the anti-lock brake system.

- Plumas Lake, CA, USA

problem #1

Jan 022013

Sierra

  • 10,000 miles
Apparently GM uses peanut oil to lubricate wiring so they can more easily insulate, etc (accorging to the GM dealer). This attracts rats and mice which chew up the wiring - potentially impacting sensors and other items controlling cruise, stability/traction control, and any number of electrical systems that the driver may be relying upon for safety. I actually had map sensor wires chewed up that disabled my stability/traction systems and inhibited engine performance. Luckily for me it happened in my driveway rather than on the highway. Dealer claims it is not warranty item even though caused by a process that GM elects to use in building the vehicle. This could impact any/every vehicle that GM builds with use of peanut oil (may indeed be all of their models).

- Santa Clarita, CA, USA