The contact owns a 2011 GMC Acadia. The contact stated that while at a stop, the vehicle rolled backwards. The vehicle was not diagnosed or repaired. The failure recurred on numerous occasions. The manufacturer was notified of the failure. The failure mileage was 80,000.

- Castle Rock, CO, USA

Ses light came on, trac control light came on/ vehicle lost power. Traveling southbound on state route 83 near wooster, Ohio two lane highway with nearly no pull offs. Lost power going up hill. Went from 55mph to barely 20 mph within seconds.

- North Ridgeville, OH, USA

June 11th 2014, it was a Wednesday. I drove over a set of railroad tracks and all of a sudden my car starts beeping and flashing all of these lights at me. The park assist off, the traction control off, the service stabilitrak" and the ?check engine? lights all come on. We are in town and not going very fast so I don?T notice the car driving any differently at first. I stop and still everything seems fine, except for all these lights flashing at me. When I try to go again is when I realized that there is a problem. My car will not accelerate. I have the gas pushed all the way to the ground and my car is moving at like snail speed, I?M trying to make a left hand turn, up a hill, to get to the parking lot but my car literally will not move! vehicles are swerving to avoid crashing into us, I call a tow truck and my finance. When we do hear back from the GMC dealership they basically tell us that we?re idiots. They test drove the car and looked it over and hooked it up to their fancy machines and there?S nothing wrong with it. August 16th. My fianc is driving, on a highway at 65 all of those same lights come on and my fianc announces, ?omg [xxx], I think it?S happening again. ? sure enough he is unable to accelerate and the vehicle stalls out in the middle of the road. Luckily for us this time we are on flat terrain and we are able to coast into my mother"S driveway. Because it is so late we decided to just go to bed and deal with it in the morning. In the morning, though, we get into the car and it drives perfectly fine. We drive 6 hours back to rapid city, with no issues, although we are sick to our stomachs. Saturday, September 27, 2014 the exact same thing happens. Dash reeds as this traction control off park assist off service traction control service stabilitrak parts of this document have been redacted to protect personally identifiable information pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Rapid City, SD, USA

I saw an error message on the dashboard that read "service traction control", then it read "traction control off" and then the last thing that read was "engine power is reduced". that's when my car dropped from going 55 mph to 20 mph and I could not accelerate. I pulled off the road a few minutes then back onto road but had no power. I pulled over and called a tow truck and had it towed to shop.they replaced accelerator pedal assembly. Cost me $259.84.

- Washington, MO, USA

My son in law was driving, I was in passenger seat, all of a sudden engine raced, tack needle went very high and vehicle began slowing down all at the same time. Son in law remove foot from gas peddle and vehicle acted normal. This has happen to me approximately 20 times prior to this. Two or three times I took it to dealer who stated the computer didn't 'register' anything. It has happened on interstate when I attempt to pass 18 wheeler in heavy traffic, very scary.

- Washington, MO, USA

Over the past month and a half I have been noticing that when I attempt to push the gas to make my car go faster that it doesn't accelerate. It is usually when my vehicle is already in motion and I attempt to go faster. I can hear it making a noise like it's trying to go faster but there is definitely a delay before the vehicle actually starts to go faster. Usually I am on a normal streets going anywhere from 35-55 mph (depending on the street and post speed limit), so it's not always a huge deal when it happens. I do a lot of highway driving and this is where my concern comes into play. A few weeks ago I was merging onto 696. There was more then enough room in the first lane for me to safely merge into traffic, however, when attempting to accelerate my vehicle it would not go above 35mph for a good 30 seconds and a car that was in the right lane probably going at least 70mph almost rear ended me. There was another instance when I was merging onto the vandyke expressway where the posted speed is 70mph and the exact same thing happened. Trying to merge into traffic with a post speed of 70mph and my vehicle not going above 35mph is not safe. My vehicle was recently in the shop because my air compressor literally melted and started smoking as I was driving my car. When it was in the shop this problem was mentioned to them and we were told "the problem would be like finding a needle in a haystack" the air compressor was fixed along with the current air bag recall, however, this acceleration issue was not addressed whatsoever. To me this is the most pressing issue and should have taken priority. I should be able to know that when I am merging onto a highway with fast moving traffic that my car is going to accelerate and not potentially cause a major accident.

- Sterling Heights, MI, USA

Service stabilitrak, and the engine power low warning lamps illuminated followed by the vehicle slowing to 20 mph. Vehicle taken to the repair facility where the technician diagnosed that the throttle body was defective and needed to be replaced. This same incident occurred several times previously. Engine reverting to low power is a hazard and safety issue.

- Margate, NJ, USA

The contact owns a 2011 GMC Acadia. The contact stated that after exiting the vehicle with the engine operating, the driver slipped on an ice patch and fell. While the contact was grounded, the vehicle erroneously rolled away and over her legs. The contact sustained muscle and nerve damage to both legs. The vehicle was being repaired. The manufacturer was not contacted about the failure. The failure mileage was 34,994.

- Rochester Hills, MI, USA

The contact owns a 2011 GMC Acadia. The contact stated that while parked, the vehicle rolled away and crashed off the side of a cliff. The contact was not injured. The vehicle was still in park when it was towed. The vehicle was taken to an independent mechanic and the contact was awaiting diagnosis. The vehicle had not been repaired. The VIN was unavailable. The failure and current mileage was 45,000.

- Hyde Park, NY, USA