really awful
Crashes / Fires:
2 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
82,851 miles

About These NHTSA Complaints:

The NHTSA is the US gov't agency tasked with vehicle safety. Complaints can be spread across multiple & redundant categories, & are not organized by problem. See the Back button — blue bar at the very top of the page — to explore more.

Get notified about new defects, investigations, recalls & lawsuits for the 2009 Chevrolet Impala:

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

« Read the previous 20 complaints

problem #77

Jun 172015


  • 100,000 miles
Reduced engine power, car cuts off while driving. Chevy is aware of defect and refuses to recall

- Bunnell, FL, USA

problem #76

May 012015


  • 112,000 miles
I was driving on the highway and all of the sudden check engine light and traction control light come on. Warnings service traction control and reduced engine power are displayed and all but shuts my car off in the middle of the highway causing cars to slam on their brakes and swerve barely missing me. I get over to the side of the road and turn the car off. Then turn the car back on same messages and won't go no where. Do the same thing again only waiting longer and no messages but check engine light still on. I drive home. Next day no warnings or lights. Couple weeks go by does the whole warnings and lights and slows car down again but doesn't completely shut it down. I was in regular street traffic this time about 35mph. And now it's more frequent sometimes a couple times a day to once every day or two. This needs to be looked at. I'm reading about this problem on a lot of Impala causing major problems and wrecks.

- Tulsa, OK, USA

problem #75

May 012015

Impala 6-cyl

  • 117,000 miles
Car struggles then kicks into gear. Got warning about traction control failing then the car says 'engine power reduced' and speed cuts in half.

- Chicago, IL, USA

problem #74

Apr 042014

Impala 6-cyl

  • 64,000 miles
The traction control, stability track and ABS lights all came on. The engine power reduced light came on and engine power was lower. I had the left speed sensor replaced and the accelerator sensor replace on August 8th after the dealership had fixed this problem in April and again in June. I was told they changed sensors then also, but I am not sure of which ones at that time. I am now having the same problem for the forth time. Replacing the sensors every few months is getting expensive. Also not very safe. I contacted GM and the woman told me to take it back to the dealership to be fixed again. I have fixed the same issue three times already. They were of no help at all.

- Meadville, PW, USA

problem #73

Apr 132015

Impala 6-cyl

  • 93,000 miles
While on my way home from work on a major highway, message lit up saying engine power is reduced, service traction control, then said starting disabled and the engine shut off mid highway with no time to react. I was almost hit by several cars, tractor trailer, and buses. I had no power steering, nothing. I have 5 children who are often in the car with me and this created a mess of traffic and could have killed people. After being scared out of my mind and stuck half in a highway lane for 5 min with traffic swerving, the car started back up with no issues and I continued home. No sign of anything today, however I am reading thousands of complaints online from other Chevy Impala owners who state they are experiencing the same issues and it comes and goes and have tried everything to fix it and it still happens every so often sometimes more than others. Someone is going to lose a life.

- Rensselaer, NY, USA

problem #72

Feb 232015


  • 303,303 miles
While driving onto a highway when I reach 56 miles per hour my vehicle lost power and slow down the brakes locked and the electrical system went haywire. The locks started locking and unlocking while the vehicle was in motion. The lights started flickering on and off and the car started shaking rapidly and the brakes locked up. Once I started the vehicle back up and the ignition switch seemed to be stuck and the air bag light displayed on the dashboard. When I turn off the vehicle and try to remove the key the key will not come out so I have to put it into neutral and back into park a few times before it will release the key. Since this has occurred I hear a knocking sound in my glove box when the door is open and closed and sometime hours after ill hear the noise and the electric will flicker.

- Los Angeles , CA, USA

problem #71

Apr 202013


  • 65,000 miles
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.

- Oakdale, CT, USA

problem #70

Feb 132015


  • 67,000 miles
While driving about 35 mph, my car instantly reduced speed and the traction control and powered reduced to engine light displayed. My car reduced speed to about 10 mph and I couldn't accelerate anymore. I began coasting. I drove directly to the dealership and was charged $400 to "fix" the problem.

- Lagrange, NC, USA

problem #69

Feb 132015

Impala 6-cyl

  • 113,149 miles
This is the 3rd time: While driving, speed reduces dramatically, service engine indicator comes on followed by warnings: "engine power reduced" and "service traction control". my research on the issue to find out how to fix, shows many people having the exact same problem that isn't getting resolved by GM. Engine power reduction to such a dramatic speed can be extremely dangerous for not only the operator of the affected vehicle, but also anyone else on the road near the driver.

- Plantation, FL, USA

problem #68

Oct 282014


  • miles
On my display I have seen daily (service traction action) and (engine power reduced) along with (service airbag) for more than a year, did not service due to cost and it is not my fault! my car usually slows down once the engine power reduced displays causing the car to jerk due to me trying to give it more gas so as not to be hit from the back. As my grandchildren and I were headed home on the freeway my car decided to just shut off. On the display it read first.. service traction action and then starting disabled service throttle. My car immediately lost power and I began to pray hoping I would not get hit from the back with my grandchildren sitting in the back. Once I pulled over my car would not start I sat for about a minute and tried to start again and it started. Just today 01/12/2015, with my grandchildren in the back of my car again my car decided to loose power again but this time it did something very different, it would not allow me to first reverse and then it allowed me to but soon after I could not go forward. The gas peddle acted as though the car was completely turned off but the car was running. When I attempted to press the gas peddle I pressed it all the way down to the floor, nothing happened. I ended up calling a towing service and after telling them what happened I was told my issues stemmed from a electrical system issue that Chevy had recalled. This does not make any sense for so many of us to go through the same issues but nothing be done about these issues. Something needs to be done quickly!!

- Tulsa, OK, USA

problem #67

Jan 062015


  • 115,000 miles
When im driving on the freeway or driving 35 mph the car gets on a limp mode and shows a "power engine reduce: And traction control and sometimes turns off on me while driving I already replace the (tps) and the throttle body because that's what the car computer was telling me and I already took the car to a different mechanics and they tell me nothing is wring with it.

- Splendora, TX, USA

problem #66

Nov 212014


  • 100,000 miles
The contact owns a 2009 Chevrolet Impala. The contact stated that while at a stop light with the brakes applied, several warning lights illuminated including the engine power reduction and traction control lights. The contact indicated that the vehicle suddenly experienced unintended acceleration and traveled into a busy intersection, crashing into a second vehicle. No injuries were reported. The vehicle was not diagnosed or repaired. The manufacturer was notified of the incident. The VIN was not available. The failure mileage was 100,000.

- Jackson, GA, USA

problem #65

Oct 202014


  • 102,000 miles
The contact owns a 2009 Chevrolet Impala. The contact stated that while driving approximately 30 mph, the reduce power and the check engine warning light illuminated. The vehicle was taken to a certified mechanic. The technician diagnosed that the accelerator position sensor failed. The vehicle had not been repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 102,000.

- Fresno, CA, USA

problem #64

Jul 162014


  • 95,056 miles
This incident has happened several times leading up to the check engine light remaining on. As I would be driving down the road at approximately 45 mph. The vehicle would suddenly start to jerk to accelerate and decelerate without me wanting to change speeds. Several of these incidents have been while I was driving in traffic. Then the message "reduced engine power" and "service traction control" would appear on the dash and the traction control light and check engine light would come on and stay on. This would also cause the car to reduce its speed and cause significant acceleration problems. I replaced the accelerator position sensor as indicated by a code look up and haven't had anymore problems with the car as of October 25, 2014.

- Smyrna, TN, USA

problem #63

Oct 132014

Impala 6-cyl

  • 111,005 miles
My engine power reduced light came on alone with the traction light.

- Mansfield, OH, USA

problem #62

Sep 182014


  • 106,000 miles
Was driving when the traction control light came on and message came across saying service traction control: Then check engine light started flashing rapidly at the same time. Follow by a very loud knocking noise from the engine. Then speed would not accelerate. Turned on flashers and coasted into parking lot. Vehicle had troubles restarting and would not move. Steering wheel was hard to turn. Tries to die while idling after you get it to start. Did diagnostics and code P0300 random misfire detection power train unable to establish a link to the vehicle. Fuel system 2 is ol, lift at 0%, spark plug 13.5, fuel level low 38.8, ECU 14.417, low acceleration. Contacted local Chevy dealership and was told it will cost $35 to tow it to their shop and about $85 just to run a diagnostic on their machine. If it is a lifter the cost will be over $700 to get fixed. I purchased this automobile in August 2013 and have just had it a year. So now I have a car payment on a car that doesn't run. I bought it at wk motors in sedalia, mo. This is the second time this car has had issues and without a warranty the dealership wont do anything!!!

- Lebanon, MO, USA

problem #61

Feb 112009

Impala 6-cyl

  • 2,000 miles
The contact owns a 2009 Chevrolet Impala. While driving approximately 65 mph, the traction control and engine reduce power warning indicators illuminated. Also, the vehicle's speed suddenly decelerated to 45 mph and the air bag sensor and tire monitoring system indicator illuminated. The vehicle was taken to an independent mechanic who was unable to diagnose the cause of the failures. The vehicle was not repaired. The manufacturer was not notified. The failure mileage was 2,000. Updated 10/22/2014 updated 4/1/2015

- Winstonville, MS, USA

problem #60

Aug 122014

Impala 6-cyl

  • 128,000 miles
Traction control light comes on. Power is reduced. Car runs and drives well. Driving on interstate the light comes on and cuts power. I had to coast to a stop on the side of the highway. We waited 5 minutes and the car started. The light went off for a day and then came back on. I hear of people replacing parts and the problem not being fixed. I can't afford to do that.

- Des Moines, IA, USA

problem #59

Jul 122012

Impala 6-cyl

  • miles
I was driving on the bypass at approximately 65mph, my check engine light came on. About 5 seconds later, my service traction control came on. As I kept driving, I lost power to my engine. Finally, my engine was disabled and I couldn't drive anymore. Luckily, I was able to pull over. After 5 minutes, I was able to start up my car. I replaced the gas pedal (because they state a sensor was bad in the pedal), but my car still keeps doing this. The dealership continues to state the throttle body/gas pedal needs to be replaced. How many times should I have to replace the gas pedal. I have even tried multiple dealers, but they all want to just replace the same component. They state that they must continue to trouble shoot until they can find the true problem. GM needs to help with this.

- Dublin, OH, USA

problem #58

Aug 062013

Impala 6-cyl

  • 56,000 miles
During normal conditions warning lights 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.

- Brawley, CA, USA

Read the next 20 complaints »