Accelerator Pedal Sensor problems of the 2009 Chevrolet Impala

My car was taken into the dealer to check on the "service engine soon" warning and I was informed that the computer showed it as an apps issue. They checked the apps and I was informed that they couldn't find anything wrong and that it had been reset within the computer system and I was good to go. Two months later while traveling at a speed of 55 mph on a highway, the service engine light came on, service stabilitrak appeared on the instrument panel, traction control off light up on the instrument panel and then the ring tone and the "engine power is reduced" came on the instrument panel. The next thing I knew was that I had absolutely no acceleration at all! I was extremely fortunate that the vehicles behind me were far enough behind me and I was able to get off of the road and on to the shoulder. Had that not been the case there could have been a serious accident causing numerous individuals to be injured or killed. I had the vehicle towed and checked and it was definitely the apps (accelerator pedal performance sensor) that was defective. Now nearly 2 years later, it has happened again. The exact same warnings came on again, only this time I was traveling in inclement weather and during rush hour traffic. There are numerous complaints regarding the exact same issue and Chevrolet/gm needs to issue a recall as the apps is defective. If no recall is issued it is a matter of time before innocent people are killed.

My name is james barr and I purchased a 2009 chevy Impala, with 123,000 miles on it, in August 2015 from mac churchill auto mall in bedford, texas. I have had no problems with this car since its purchase until November 29th. While en route to emory, texas, my car started displaying "engine power is reduced" and "service traction control" messages. About 99% of the way there, I suddenly got a lurch and my car slowed down, with steering and braking not working. I was able to get my car off the highway safely but had to use my emergency brake to stop my vehicle and get it turned off. I tried repeatedly for several minutes to get it going again, but it would not start. After about five minutes, the car restarted normally and has performed flawlessly since. However, I am concerned. I've had a garage pull and diagnose the problem. The error codes that were pulled are p2122 and p2138 ,regarding the accelerator pedal position sensor. I've researched this and this appears to be a common problem from what I've been able to ascertain from my research. . Read more...

2009 Chevrolet Impala. Consumer writes in regards to connection within the accelerator pedal position sensor may reduced engine power and cause loss of traction control assist.

2009 Chevrolet Impala. Consumer writes in regards to accelerator pedal position sensor issues. The consumer did not agree with Chevrolet when they stated to let the failure occur first, then they will fix it.

Last night, I started up my car and immediately the car started to shudder pretty hard. My car started chiming and a service traction control showed up on my dash, followed by an engine power reduced. The light indicator for my tc was lit. I immediately turned the car off and tried to restart it. The same thing happened again. I turned it off and waited 2 minutes before restarting. It started fine, with no bad indications. The car also drove normally. A few hours later as I was starting home, it happened again. My car was still parked as before when the indications showed up. Shut off and restarted and it cleared out. No problem once I started driving. This morning was no different. So far, this only has happened when I was starting my car up. I have been fortunate that this hasn't happened to me while the car was in motion- yet. Other people with this problem haven't been so fortunate. There has been no bad weather at all. Dry as a bone. I bought this car in 2010 knowing it used to be a rental. I have had no problems with it until now. I took my car into my chevy dealership, who thought it might be the throttle body sensor. They are ordering the part in, but I'm still skeptical if that is really what is causing it. I have heard the sensor on the hub assembly could cause this, as well as the accelerator pedal sensor. From reading multiple forums, many owners have had scary experiences with the car decelerating on freeways or other dangerous places that could result in wrecks and personal harm. They had taken their cars in multiple times and shelled out thousands trying to fix this phantom ghost problem. Frankly I am amazed there has been no recall for this. I am moving to CA, and I'm driving there by myself in less than two weeks. I can't have my car try to do me in right now, nor do I have endless amounts of cash to fix a mech's guess. Warranty does not cover this.

I was at a stop sign and the reduced engine power, check traction control lights came on. The code came up I had it checked it is the accelerator pedal position sensor this can be a very dangerous occurrence . Nhtsa please look at these complaints it is a 75 dollar part and labor of 4 hours. Im paying for part and doing myself I need some reimbursement or payment of this to shop.

During normal conditions warning ligths flash "service traction control" along with abs light. There is a grinding noise in the front left side wheel. Also seat belts light flash. Already replaced accelerator pedal sensor.

The contact owns a 2009 Chevrolet Impala. The contact stated the accelerator pedal position sensor failed and called the vehicle to slow down to 40 mph. The contact stated that the traction control light illuminated on the instrument when the failure occurred. The sending unit was replaced and the vehicle began to perform normally. The dealer informed the contact this was a known problem. The failure and current mileage was 81,506.

While driving on the highway at approximately 70 mph the car began to lose acceleration and dropped all the way down to 40 mph. The check engine light, service traction control, service stabilitrak, and reduced engine power message displayed as well. The car began shaking and would not accelerate. I had to pull off to the side of the highway and turn the car off to try and get the issue to subside. Once back on the road, not more than 3 miles later the issue surfaced again. I ended up having to get off the highway and drive (very slowly) back to my house. Not sure if it will be safe to drive back to the dealership to be addressed. I have replaced the wheel hubs and throttle pedal sensor in the past few years in an attempt to correct. This was an intermittent issue until recently and even after having it fixed by a certified Chevrolet dealership, the issue occurred again. This most recent incident could have ended in serious injury had I not been lucky enough to not have any cars immediately around me. With the amount of consistent complaints about this particular issue with this particular model of car I hope it can be addressed.

I was driving 55mph 4/10/2013 then I go down to 40 and message sensor says engine low pressure or something like that so I took it to auto zone and they said throttle sensor make the check engine light come on now 4/27/2013 the light came on again now they saying the pedal sensor and the low engine pressure check engine light is on again.

I have a 2009 chevy Impala lt & was driving aproximately 50mph down the road when all of a sudden the "service traction control message came on, the check engine light came on & engine power will be reduced message came on". The cars speed dropped down to about 40mph & would hardly go. I didn't know what was going on. It really scared me because I thought my car was going to cut off. I did get to work safely but I am terrified to drive this car. I searched message boards on the internet & came across 297 messages from other people who own gm vehicles that this has happened to. A couple of people said their cars actually cut off on them while going down the highway at a high rate of speed. One was involved in an accident. The problem from what I have read has something to do with the accelerator pedal position sensor or throttle body. From what I have read gm knows about this problem but has not done a recall on this. A couple of people posted that their local chevy dealership covered the repair even though their cars were no longer under warranty. I called my local chevy dealership and they told me that they couldn't do anything about it. They said that I would have to pay for repairs myself. To me, this is unacceptable. I could have a wreck & get killed or kill someone else. I don't understand why a company would clearly know about a problem with their vehicles and do nothing about it. I think that gm should cover the repairs to my vehicle and to any others that are having this problem.

I have a 2009 Chevrolet Impala that I purchased in 2010. Several months later, the car began to read check engine, service traction control, reduced engine power, then stalls and jerks while I'm driving. It happens intermittently. I took it to autozone to have them check the computer code. They said it was the accelerator pedal position sensor. The car only has about 50,000 miles on it. I am planning o taking it to the dealership because it is happening more often and I am afraid that I will have an accident as a result of this problem.

The contact owns a 2009 Chevrolet Impala. While driving approximately 35 mph, the vehicle surged forward slightly until the contact applied the brakes. The vehicle was taken to an authorized dealer where the contact was informed that the pedal positioning sensor failed. The vehicle was not repaired. The failure continued to recur intermittently. The failure and current mileage was 64,867.

I bought a 2009 chevy Impala with 35k miles on and not even a month after I bought it I started having problems with the traction control on acceleration and sometimes on braking. . . I see with all the internet complaints that this is a wide spread problem that gm seems to be putting off. . I have contacted gm and they told me the same thing as every other complaint take to dealer and spend over $100 just to get it looked at and the dealers say the same 3 things as all other complaints it could be three things. . Gas pedal sensor, brake pedal sensor, or the sensor on the hub assembly. . . Hmmmmmmmmmmm gm help. . . Ps after I got mad on phone gm agreed to pay a mere $90 of the bill which is gonna cost over $300 to fix. . . .