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really awful
Crashes / Fires:
3 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
84,270 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.

2008 Chevrolet Impala engine problems

engine problem

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2008 Chevrolet Impala Owner Comments (Page 1 of 4)

problem #72

Jun 062016


  • 76,000 miles


Communication between gas petal and throttle body breaks down causing vehicle to display reduced engine power causing vehicle to slow to 20 to 30 mph instantly. Happen on highway almost causing accident due to slowdown. Should be safety recall before someone or myself gets killed.

- Taunton, MA, USA

problem #71

May 212016


  • 13,200 miles
Takata recall. It happen to me twice I got two kids the car lost power from 45 to ten. Engine light is on. The code thst comes up is P2138 this is not ok needs to get fixed. First time it happen I was on a highway the car behind me almost hit me due to the engine power loss.

- Los Alamos, NM, USA

problem #70

May 012016


  • 2 miles
While driving my car for only two minutes, the reduced power sensor came on and traction control came on also. My car would not go above 20 mph. Went back to normal after an hour. Very concerning if I was on the interstate when this happened.was on a back country highway when this happened.

- Heathsville, VA, USA

problem #69

Mar 222016


  • 276,138 miles


I was left sitting on the side of the road. I was going 70 mph on I-94 when the "service traction control" light came on, followed by the "engine power reduced" light, then something about "disabling throttle" sensor... my car shut completely down, leaving me to coast across 4 lanes of traffic on interstate 94. I've owned this 2008 Impala for just about a year... I don't know what to do I received the letter about an extended recall back in December and I called GM because there's a stipulation of the amount of miles you can have on your car to have this problem repaired... because my car has 276000 miles GM told me there is nothing they can do, at that time I asked why this item wasn't recalled. I was told if I felt the problem called for a recall I should reach out to the national highway and safety commission. I don't even feel comfortable driving my car anymore... this is a death trap!

- Southfield, MI, USA

problem #68

Feb 042016


  • 118,000 miles
I started see a warning light on in my car that read "engine power is reduced, service traction control" so I sent GM an email regarding this and maybe a month or so later I received a notice that said the gas throttle sensor will cause this to appear when it is bad. They advised if I felt this was the problem I could take it to a GM dealer and have it check, but if it wasn't they would not cover it and I would be responsible for the cost of the diagnostics test. I took my car and took my car, along with the notice to sunrise Pontiac on 12/31/15. I was told that I needed a thermostat a gas pressure sensor. The cost to repair these items would run me almost $900 and I could not afford that T this time. I asked the technician, which could I get away with not fixing right now and he said I needed to go ahead and replace the thermostat to get the check engine light off. I had that work done and the light still was on, as well as, the warning lights. So I contacted GM again and advised them of the situation. They paid for me to go to serra Chevrolet to get another diagnostic done. This time I was told I needed an app sensor, gas pressure sensor, thermostat (which had already been replaced), and a temperature sensor, all of which would run me $1300. I told them I could not afford that and left. I contacted GM once again and explained what was told to me and asked why the sensors would not be covered when they were apart of the gas throttle body? now I'm getting a warning that says "starting disabled service throttle " and my car is literally cutting off while I'm driving. I feel like this is a matter that GM should be willing to repair for their consumers to prevent accident or death. I 've read on google that several Impala owners are experiencing the same thing. Also, while I'm driving my gear control is popping out. This is my only means of transportation.

- Memphis, TN, USA

problem #67

Jan 302016


  • miles
While driving any speed, "reduced engine power" light comes on. Happened 3 times and then I received a letter from GM took to dealership for repair. They repaired throttle body. Car still acted the same after I got it. Due to snow storm I didn't drive it a few days. Two weeks later, engine power reduced starts again on the highway going 70mph (this has happened 6 times altogether) now GM advised me to go back to dealership for diagnostic test. They claim it's the gas pedal sensor ans not covered. Replacing the throttle body did not ing to fix the issue and many others have has this same issue. Now GM refuses to make it right and I'm stuck without a vehicle because I can't afford repairs and the car is way too dangerous to drive.

- Shelbyville, MI, USA

problem #66

Jan 132016


  • 115,000 miles


The contact owns a 2008 Chevrolet Impala. The contact stated that while driving at 65 mph, the vehicle failed to accelerate when the accelerator pedal was depressed. A warning message in the instrument panel indicated that the power was greatly reduced. The failure recurred intermittently. The vehicle was taken to an independent mechanic where the failure was undetermined. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 115,000. The VIN was not available.

- Spencerport, NY, USA

problem #65

Jan 062016


  • 266,000 miles
While driving my car will no longer register the throttle position causing the engine power to reduce and the car to decelerate (from any speed) this has happened both and streets and highways. GM has already issued an "additional warranty" for the problem "throttle positioning sensor"

- Southfield, MI, USA

problem #64

Nov 132012


  • 128,834 miles
The contact owns a 2008 Chevrolet Impala. While driving 65 mph, the vehicle lost power and the speed reduced to 35 mph. The check engine warning light illuminated. The vehicle was taken to a dealer where it was diagnosed that the throttle position sensor needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 128,834. Updated 04/26/16

- Gilbert, AZ, USA

problem #63

Aug 022015


  • 140,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated that on several occasions while driving the vehicle, the reduced engine power warning light illuminated. The contact stated that when the accelerator pedal was depressed but the vehicle failed to respond. The failure was intermittent. The vehicle was taken to be diagnosed. The contact was informed that the throttle position sensor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 140,000. Updated 02/18/16

- Jeffersonville, OH, USA

problem #62

Nov 112015


  • 5 miles


Reduced engine power message. This message came up after have car at mechanics for a repair on actuator. We took back to mechanic and he cleared message however message has appeared after a week of driving car less than 10 miles per day. Mechanic said possible fix resulting in another $300 repair. The message came up while doing local driving around town less than 5 miles before it will appear

- Breinigsville, PA, USA

problem #61

Sep 132015


  • 115,000 miles
(reduced engine power) my 2008 Chevy Impala randomly shows down after the dash reads reduced engine power. I am lucky to be alive I was doing about 60 on the expressway and the car speed just dropped to 20mph I had to swerve because the car behind could not slow down in time. My two year old was in the car and I hear that GM cars have this problem all the time. This is ridiculously dangerous someone has to do something about it. The GM dealership has no ideal how to fix this.

- East Chicago, IN, USA

problem #60

Aug 262015


  • 140,000 miles
The contact owns a 2008 Chevrolet Impala. While driving 65 mph, the engine power reduced and the engine light warning indicator illuminated. The vehicle independently decelerated to 10 mph and failed to accelerate. The vehicle was taken to an independent mechanic where it was diagnosed that the throttle body control module needed to be repaired. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was 140,000.

- Los Angelos , CA, USA

problem #59

Sep 252014


  • 107,500 miles
While driving my car on the freeway suddenly the check traction control light came on and there was reduced engine power. I was traveling at a rate of 75 mph and quickly went down to 45 - 50 mph causing a 3 car rear collision.

- Saint Paul , MN, USA

problem #58

Jul 082015


  • 123,000 miles
I was driving on interstate 81 in cny when my dash lit up and said "service traction control, reduce engine power" at that point my car would not down shift to accelerate. About 15 miles down the road my car said "service throttle control sensor", and the engine shut off!!! I was just coming out of a huge work zone and I lost power steering and power brakes in the left lane of a 3 lane highway. I made my way to the shoulder as safely as I could and was unable to restart my car for at least 5 minutes!!!!!! 3 days later it did it all over again on a country road thankfully!!. I remember the reduce engine power service traction control had acted up once before in 2012 right after I bought the car. This needs to be recalled immediately before someones engine shuts off when they are going faster than 45!!!!!!

- Mcgraw, NY, USA

problem #57

Jun 132015

Impala 6-cyl

  • 109,000 miles
I was driving down the street and out of nowhere the engine light came on and said engine reduced power. The car seemed to slow down and not have power. If I came to a stop and began to drive again, the car barely accelerated and the transmission jerked every single time it shifted. I had every car going around me down the busy street, because the car would barely go. I was worried I wouldn't even make it home and that the transmission was going to have serious problems along with the engine as it jerked roughly with every gear change. This is something that needs to be recalled immediately! it couldn't have happened at a worse time, as I just purchased this car a few weeks ago, have my first child on the way, and just got a house.

- Indianapolis, IN, USA

problem #56

Mar 152015


  • 98,000 miles
I started my car and the RPM's went to 0. message stated "service traction control" and engine power reduced". when I looked up information online I noticed many people had the same problem with Chevy/GM cars.

- Ronkonkoma, NY, USA

problem #55

Apr 172013


  • 140,000 miles
Was driving down the road and out of no where my car flashed a message that said service traction control and then engine power reduced and my car came to an almost complete stop. It would not accelerate at all. This has happened many times now and have caused very dangerous situations while going down the road. The problem will go away after the car has been turned off for a few hours but it will do it again out of no where I have tried to have this fixed multiple times ad there is no fix! it is very dangerous and there should be a recall before someone is killed!

- Celina, TN, USA

problem #54

Apr 012014


  • miles
Letter from constituent who experienced problems with her 2008 Impala, seeking reimbursement for the repairs she believes were all part of a recall. The consumer stated on April 1, 2014, she had just exited the interstate highway, when suddenly the engine shut off. The vehicle would not re-start and a message appeared on the dash that read throttle control system. The vehicle was towed to a service station. The throttle body was replaced. On April 19, 2014. The check engine light illuminated as she was driving. She pulled into a parking lot, and turned off the engine. The vehicle did not re-start, once again, the vehicle had to be towed. The power train control module had to be replaced and the computer was re-programmed.

- Amherst, NY, USA

problem #53

Aug 012013


  • 75,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated that when attempting to accelerate from an idle position, the vehicle briefly hesitated and jerked violently. The contact stated that on one occasion while driving 45 mph, the failure occurred and the vehicle independently decelerated. The vehicle failed to accelerate higher then 5 mph. The check stability tract and engine power reduced warning indicator illuminated on the instrument panel. The vehicle was taken to the dealer on 3 occasions. The dealer was unable to diagnose or replicate the failure. The vehicle was not repaired. The failure mileage was approximately 75,000.

- Roseville, OH, USA

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