Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
23,800 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2012 GMC Sierra 3500 drivetrain problems

drivetrain problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2012 GMC Sierra 3500:

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

2012 GMC Sierra 3500 Owner Comments

problem #2

Feb 202014

Sierra 3500

  • 31,200 miles


While driving on highway, transmission shifts hard to higher gear. This started all of a sudden will take to dealership.

- Edgewood, NM, USA

problem #1

May 162013

Sierra 3500

  • 16,400 miles
While pulling my fifth wheel trailer 12500# at highway speed 65 mph pulling a grade the check engine light came on and the reduced engine power message appeared on the dash. This reduced and limited the speed to 50 mph and steps the truck down from there until you can only do 20 mph on the interstate. This issue has happened three times in three months.

- Wyoming , NY, USA

Search for these popular complaint phrases...

Not what you are looking for?