The contact owns a 2011 Chevrolet Impala. While driving 70 mph, the contact experienced difficulty maneuvering the gear shifter and the vehicle jerked. The check engine and service throttle indicators illuminated as the engine stalled. The vehicle was taken to a mechanic, who stated that the throttle position sensor needed to be replaced. The failure recurred. The vehicle has not been repaired. The manufacturer was not notified. The approximate failure mileage was 113,982.

- Murfreesboro, TN, USA

I was on the highway doing 60mph and my dash showed a message engine power reduced, service traction station, service stabilitrak. The steering wheel completely locked up and the car shut off. I almost caused a major accident a car had to swerve around me. I managed to get to the side of the road in the construction area. This has to be looked into. I've researched online and I see a lot of Impala are having this same problem. This should be considered a serious safety risk.

- Dumfries, VA, USA

The contact owns a 2011 Chevrolet Impala. The contact stated that while driving 70 mph, the vehicle began to rapidly decelerate. The service traction, check engine and reduced engine power lights illuminated on the instrument panel. The vehicle was taken to a dealer where the technician diagnosed that the throttle position sensor malfunctioned. The throttle body and gasket were replaced. The manufacturer was made aware of the failure. The failure mileage was 64,613. The current mileage was 72,200.

- Rockford, MI, USA

While driving home from work one evening the gas pedal seemed to have a mind of its own. As I removed my foot from the gas and when to apply the brake the gas pedal did not come back up and was stuck in position. This has subsequently happened on 2 other occasions as well. My 2011 Chevrolet Impala is 3 years and 6 weeks old. As my local Chevy dealer (Chevrolet of homewood il) has informed me my throttle sensor is sticking causing the gas petal to stay down. Common sense would tell anyone this is not a good thing. I was informed that because my warranty expired 6 weeks ago that the $500. Repair to replace a sensor is my responsibility. Now I understand the warranty expiring. However, a sensor on the throttle is a part I believe should not go bad after only 40000 miles. How many potential accidents are waiting to happen because of a problem like this. This is my wife's car and she experienced the gas pedal sticking in the down position on at least 3 occasions. Luckily she was not in a dangerous situation when it happened. This is something I feel should be brought to the attention of GM Corp. Thank you for a forum to let someone know and hopefully something can be done before someone gets seriously hurt.

- Oak Lawn, IL, USA

Traveling at highway speed, the dashboard lights came on and the vehicle began to lose speed. Stepping on the accelerator pedal had no effect and I moved to the right lane, I had been passing another vehicle at the time. I drove the car at the speed which it permitted with my four-way blinkers on until I arrived home. It was at night and there was no where else to go. The next day, the problem was not evident, but I took it to the dealer from whom I had purchased it, used. That dealer was unable to ascertain the problem, and took the car to a local Chevrolet franchise where it was "repaired" and returned. Several days later, the same problem occurred when I was entering a highway I could not accelerate into traffic. This time, as it happened during the day, I again took it to my dealer. It was suggested that I deal directly with the local Chevrolet dealer to whom he had taken the car the first time. That dealer had it for several days. The dealership contacted the factory directly for instructions to fix the problem, . to date, there has been no re-occurrence of this, nor any other problem. The first visit for repair cost about $200 and the second $500. I contacted General Motors directly and they agreed to refund $250 earlier this year.

- Lancaster, PA, USA

Started car had car for 2yrs now no problem what so ever and the service traction and stability control and also reduced engine power came on as well as engine light it jerked went it shifted and didn't act like it had it power as always but I just drove it 35 mph to get it home this I would think is a great big safety issue shouldn't GM have a recall on this?

- Winchester, KY, USA

The contact owns a 2011 Chevrolet Impala VIN #[xxx]. the contact stated while driving the vehicle increased and decreased in speed with out no control. The contact mentioned that the speed reduce service traction control warning light illuminated. The vehicle was diagnosed with a throttle body defect. The vehicle was repaired but the failure recurred. The manufacture was notified of the failure. The failure mileage was 27,000 and the current mileage was 27,800. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Somerville, NJ, USA

The contact owns a 2011 Chevrolet Impala. The contact stated while traveling various speeds, the check engine light illuminated and the vehicle lost acceleration power. The vehicle was taken to the dealer who stated that the speed sensor failed. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 40,000. The VIN was unavailable.

- Baltimore, MD, USA

I was driving my car and it began to shake and lose power and would not accelerate. The check engine light came on with messages reduced engine power, service stabiltrak. This has been happening quite a bit with this car. I have been researching online and have noticed that numerous complaints have been filed going back years. GM should take care of this problem as it is happening with numerous vehicles. I drive on the interstate every day and if this happens there I hope it doesn't cause an accident.

- New Lenox, IL, USA

I was driving on I70 going 70 mph and out of nowhere my engine light comes on and 3 messages start appearing on the dash. 1) service stabiltrac, 2) service traction control, 3( engine power reducing. My car a 2011 Chevy Impala slows down to about 50. I get it going back to 60 but not very easily. I keep going and merge onto 465 (indianapolis Indiana area). I come into slower traffic where I need to stop. I apply my breaks and the pedal will not engage. Almost hit a car. Also when I slowed down the car started shaking bad. I continue a little farther in slow traffic and had to stop again, same thing with the breaks. So I pulled over and shut off my car on the side of I465. My daughter had looked up the error messages on the internet and there seem to be a lot on there with the same problem. They all said the same thing, after shutting the car off and restarting it it was fine. I made it home and everything seemed fine for a couple of weeks and it happened a few more times so far. Once at a stop sign and the same day as I was backing out of parking space at work. Once again that same week I was driving in town and took off from a red light and it happened again. From a complete stop the car started shaking and the error messages and engine light come on and it would not accelerate. I would have thought nothing about it except to get it fixed, but after reading so much on the internet about the same problem there has to be an issue and needs to be recalled. GM needs to own up to this problem before people get injured or worse die from this issue.

- Wabash, IN, USA

As I was driving down the road my car lost speed drop from 35 mph to 20 mph, the check engine light came on and the triangle with the car and skid marks then it kept flashing the service stabilitrak control, engine power reduced, and service traction control and it started to jerk and jump. I have been having major issues out of this car first it was the right hub (eating tires), then the left hub (eating more tires), then the transmission and gear shift completely gone (replaced everything) now this plus the front tires are still getting ate up. This is an ongoing problem with this Chevy Impala. I am so ready to get a Honda. As I see there are other owners that are having similar problems. Why isn't it a recall on these problems" nobody likes too loose their money for something that should have been taken care of by GM in the first place. What will GM do if all customers protest about these issues that should be recalled on whether its for the public, private, or government sector"

- Tallahassee, FL, USA

The check engine light came on (and had gone out) previously. Dash said "service stabilitrac, engine power reduced" and a mechanic said it was a "sensor in the gas pedal" and that if it kept happening we should replace it. I didn't fully realize that this meant that the throttle would disable itself while I was driving in morning rush hour traffic on the highway in the left hand lane going up a hill doing 60 mph. There was traffic behind me and in other lane so I had to pull into the center shoulder overtop of 5 inches of snow and ice. It was a struggle not to hit the guardrail. There was barely enough room. I just made it over the yellow line. It was 20 degrees and then had to wait an hour for a tow truck. The car did start and drive at the garage. This mechanic replaced the acceleration pedal assembly. The error was code P2122. He also stated that he could smell burning wires. I had smelled it but didn't realize what it was.

- Upper Darby, PA, USA

I was driving down the interstate with the cruise control on when suddenly my car jerked and a message showing "engine power reduced, service stabilitrak" showed up. I noticed the rpms jerking up and down with a pretty dramatic range. When I slowed down my car started shaking. The worst part is that when I shut my car off the problem stops. This has happened 4 other times. Once while idling. Once while slowing down from 55 to 35 and once while driving about 35 mph. There seems to be no pattern and it is intermittent.

- Lafayette, IN, USA

Driving and the car shut off completely.

- Denver, CO, USA

While travelling on the highway, in the rain, the power to the engine suddenly and drastically slowed down. The warnings showed up on the screen" stabilitrak, traction control, engine power loss.

- Winder, GA, USA

When driving, noticed on the freeway, it wasn't smooth at times. The transmission's shifting was pretty rough. No indication of any issues popped up on dashboard. When arriving at a freeway ramp, it felt like I was hydroplaning, but on gravel. Then, noticed when pressing the accelerator, was not going anywhere, but felt like I was in neutral. Was able to pull over and take a look... transmission fluid was fine... nothing popped up on the dashboard. Nothing! the indicators for tires, oil, etc were showing info, but nothing to indicate it had died or if there were any engine issues. Had brought it to the dealership where I had bought the car 11 months ago. The mechanics were saying that they have never seen such an huge transmission failure before. They would have to replace the whole thing.

- Seatac, WA, USA

We are leasing a 2011 Chevy Impala, and with no warning after 3 chimes a message will come up on the dash stating "service traction control, engine power reduced". the vehicle will start to slow down and sometimes completely shuts off while driving 65 mph on the freeway. Took it to the dealer and they charged me $357 to replace a defective computer chip in the gas pedal. I did some research on line and there were a lot of consumers that experienced the same exact problem and when they took their vehicles into the dealer for repair their vehicles were diagnosed with the same issue. I feel this is a safety problem because no one driving behind you expects your vehicle to suddenly drastically slow down or even stop with no warning. There is a possibility that you could be injured by a rear end accident. I'm sure by now Chevy is aware of this defective part and they should put out a recall to fix this problem so that consumers are aware about it and not have to come out of pocket for repairs.

- La Mesa, CA, USA

The contact owns a 2011 Chevrolet Impala. The contact stated that while driving 60 mph, the speed reduce alert illuminated as the vehicle speed independently decelerated to 40 mph. The vehicle was taken to the dealer for inspection and they stated that the accelerator chip needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 49,000. The VIN was unavailable.

- Breaux Bridge, LA, USA

This has happened multiple times to my 2011 Impala. I will be driving normally, anywhere from 45 to up to 65 mph, and I will get a warning saying "service stabiltrack, service traction control, engine power reduced". usually I can shut the car off and wait 5 minutes, and the messages will clear, but the check engine light will remain illuminated for the next couple of days, eventually clearing. There needs to be a recall for whatever is causing this, because there are a lot of folks with Impala having this same exact problem. We as the consumer, should not have to pay money out of our pocket, for a problem that Chevrolet caused during the manufacture of this car.

- Baldwyn, MS, USA

Driving 30 mph in a small town. A "binging" noise sounds 3 times and the traction control warning light as well as the check engine light came on. Vehicle messaging system stated that to "service stabilitrak, " "service traction control, " and "engine power reduced. The acceleration was noticeably reduced as well as a significant difference in maintaining speed. Merging onto a highway the cruise control would not kick in when setting speed which made it difficult to manage a 65 mph speed limit.

- Rochester, MN, USA