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.

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really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
19,375 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.

2006 GMC Sierra 1500 transmission problems

transmission problem

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2006 GMC Sierra 1500 Owner Comments

problem #3

Mar 122009

Sierra 1500 4WD 8-cyl

  • Automatic transmission
  • 54,000 miles


The contact owns a 2006 GMC Sierra 1500. While the vehicle was parked on a non-leveled surface, it rolled backwards into a river. A police report was filed. After inspection, the contact concluded that the transmission did not engage itself into park, which allowed the vehicle to shift into reverse. He is in the process of notifying the dealer and the manufacturer. The failure and current mileages were 54,000. Updated 5/7/09 updated 05/12/09.

- Independence, WV, USA

problem #2

Jul 012006

Sierra 1500 4WD 8-cyl

  • Automatic transmission
  • 3,000 miles
When the transmission shifts from 2nd to 3rd there is a hard clunking, also when it down shifts from 3rd to 2nd. I have had this 2006 GMC for only 10 months and I purchased it new. I took it to my local dealer for the problem and they told me that this is normal noise for a four wheel drive. I have had many 4X4 gms in the past and not one of them has had this kind of a shifting problem. I have purchased three new GM's in the last 4 years and I have had problems with all of them, I think I'm going to trade it in for a Toyota.

- Red Bluff, CA, USA

problem #1

Feb 012006

Sierra 1500 4WD 8-cyl

  • Automatic transmission
  • 1,126 miles
Seats popping noise when weight shifts (start, stop, etc.)first attempt was to replace the seat back. Second was to replace the entire seat minus the cover. Third time in the service manager wanted to contact the area GM manager for direction. The GM area manager told the service manager to make no repair and direct me to call GM. This truck also has been in for service to the brake rotors to be re surfaced with only 4,600 miles on the truck. The transmission has re calibrated two times one for the lock-up torque converter, and once for a hard shift from first to second gear. The truck has a harder shift now than before.

- Newport, NC, USA

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