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really awful
Crashes / Fires:
3 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
85,321 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 2 of 4)

« Read the previous 20 complaints

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

problem #52

Nov 052014


  • 101,205 miles
While driving 65mph on highway 526 in SC, our 2008 Chevy Impala experienced reduced engine power and a traction control error message appeared on the dash. The vehicle lost engine power and my wife, daughter and I were almost rear ended. We have now spent hundreds of dollars trying to repair the issue but with no solution in sight.

- Goose Creek, SC, USA

problem #51

Dec 012014


  • 87,660 miles
When I started my vehicle, the service traction control message appeared. Also, the check engine light and reduced engine power message. During my drive to work I could not go beyond 40mph or 2rpm.

- Detroit, MI, USA

problem #50

Nov 222014


  • 108,889 miles


Driving 40mph check engine light came on then reduced engine power flashed on message board several seconds later traction control light came on and service traction control came on message board. My speed was reduced to 20mph in traffic! luckily I was able to pull over safely without causing any accident (fyi I had my daughter in thr car with me). I will be taking the car to a Chevy shop in the morning where im sure I will have to pay high cost out of pocket even though this has been an issue for Chevy owners (online search) and there has been many complaints with no recall. This is a serious issue and I feel it is putting many lives in danger and should have been a recall a long time ago. Im just lucky I wasn't on the highway yet because this could have turned fatal.

- Fairborn, OH, USA

problem #49

Oct 272014


  • 61,850 miles
So im drving down the expressway I57 at about 85mph and the car beeps 3 times displaying service stabilatrack/ service traction and check engine seconds later the car completely cut off. While in traffic.

- Country Club Hills, IL, USA

problem #48

Jul 182014

Impala 6-cyl

  • 113,455 miles
The airbag light will not go out, the stability control light comes on and the car loses power and the engine starts to cut off. I have sent my car to the dealership twice for the same problem I have even called the Chevrolet corporate office. Each time I get a different answer as to what the problem is the first time. I was told it was sensors that needed to be replace and that it would cost $1200. This time I was told it was the spark plugs that is causing the car to shut down and the cost would be around $400 or $500. The first service in July my receipt says they did a multi-point inspection would that not tell them my plugs were bad? my car is still at friendly Chevrolet in dallas can you please help. My daughter drives this car and she a high risk pregnancy.

- Dallas, TX, USA

problem #47

Sep 022014


  • 210,000 miles


The contact owns a 2008 Chevrolet Impala. While attempting to accelerate, the vehicle hesitated and failed to respond before operating as normal. The vehicle was taken to an independent mechanic who was unable to duplicate the failure. The manufacturer was notified, but no solution was offered. The failure mileage was 210,000.

- Flint, MI, USA

problem #46

Jan 022014

Impala 6-cyl

  • 80,000 miles
Throttle disable light comes on and the engine shuts down, including steering. This has happened twice. The first time was January of 2014, speed was approximately 50 mph. We were able to steer the car into a neighborhood and after about 30-40 minutes, the engine started again. This happened again yesterday, in a much more dangerous situation. I was entering a highway with traffic travelling at and above posted speed of 70 mph. As I merged, the throttle disabled light flashed on and the engine immediately shut down. Luckily I was able to steer the car onto the shoulder. I truly feel my life was in danger. The vehicle started after about 30 minutes of me sitting on the very busy shoulder of this highway.

- Saline, MI, USA

problem #45

Oct 012010


  • 85,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated that while driving at approximately 60 mph, the engine stalled. The check engine and the power reduced warning lights illuminated. The vehicle was restarted and the failure recurred on multiple occasions. The vehicle was taken to the dealer, who diagnosed that the pedal sensor needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The approximate failure mileage was 85,000.

- Parrottsville, TN, USA

problem #44

Mar 012013


  • 50,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated that while driving at approximately 50 mph, the engine power reduced warning light illuminated and the vehicle failed to accelerate when the accelerator pedal was depressed. The contact also stated that the vehicle would not accelerate over 30 mph. The vehicle was taken to an independent mechanic, who repaired the throttle pedal sensor and the evaporate system. The remedy failed to repair the failure. The contact mentioned that the throttle pedal sensor was replaced on several occasions but the failure persisted. The manufacturer was notified of the failure. The approximate failure mileage was 50,000.

- Chicago, IL, USA

problem #43

Jan 172014

Impala 6-cyl

  • miles


2008 Chevrolet Impala. Consumer writes in regards to vehicle key fob recall notice and seeks reimbursement for throttle body control unit. The consumer stated on 2 separate occasions, a sensor went off and she lost engine power and the brakes. The mechanic replaced the throttle body control unit.

- Sun Valley, CA, USA

problem #42

Jun 202014


  • miles
Service traction control/engine power reduced lights came on dash. Car lost all power and when stomping the gas pedal speed would resume, very hesitant from a dead stop. Car was jerking, shut off traction control and car jerked then too. GM needs to fix this before there are deaths. Also I have no unlocking doors. They have to all be manually unlocked. Battery was replaced in car and on key fab. Gas pedal sensor and throttle body sensor are the triggered codes, GM needs to find the real solution as these don't seem to fix problem.

- Eureka, IL, USA

problem #41

May 092014

Impala 6-cyl

  • 100,000 miles
Our 2008 Impala ls, with 100,000 miles, is having the same problem I am seeing at this web site and all across the internet. Last month, may, 2014, and this month, June, 2014, there was a sudden reduced power alert on the dashboard and the check engine light came on. The speed immediately dropped to no more than 35 mph. Before I could get it to advance to have them check to see if any codes had been dropped by the computer, the check engine light went off. There was no reduced power message either, and the speed returned to normal. I was told to try fuel injector cleaner, which I did. All went well for almost a month, when the same thing happened again this month. This time I was able to get it to advance with the check engine light still on. The computer had dropped 2 codes, both related to the accelerator pedal position sensor. Advance did not have the part, nor did autozone. Fortunately, Napa did, for $90, including tax. Our local Chevy dealership wanted $50 more. Since it is a very easy part to replace even for an amateur like me, I replaced it. There are only 2 10 mm bolts to remove and an electrical connection to unplug. So it was pretty simple, and so far, this has done the trick, but it's only been 24 hours. This apparently is a job that the dealerships want to charge $300 to $400 to do. As I said, this is a widespread problem for GM, and they have not and will not, so far, do a recall. They should. I'm only out $90 so far, but other people are out much more. If I have the dreaded, follow-up problem with the throttle body, I will be out a whole lot more. I sent an E-mail to Chevrolet after the first instance, and did get a response back. I told him I didn't want to take any further action unless this happens again. I will be contacting him again now about this latest incident.

- Inwood, WV, USA

problem #40

Sep 182013


  • 53,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated that while driving 70 mph, the vehicle decelerated and the reduce engine power warning lamp illuminated. The vehicle was not taken to the dealer. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was 53,000 and the current mileage was 54,000.

- Oklahoma City, OK, USA

problem #39

May 212014

Impala 6-cyl

  • miles
This is the second incident we have had with our 2008 Chevrolet Impala where this problem has occurred. The most recent incident was on Wednesday May 21st, around 730 pm. My wife was driving on a road with a posted speed limit of 45 miles per hour, she said she was going about 48 when the traction control light came on, and the messaging system indicated "reduced engine power." When this happens the vehicle slows rather rapidly, and then it is impossible to accelerate beyond about 30 miles per hour or so. Due to the rapid decline in speed and the fact that this occurs without warning, I believe this should be an immediately acted upon problem. I contacted GM only to be told that I have to take it to get it looked at by one of their local dealerships, and pay for that diagnostic. In my online research I have discovered many, probably in the hundreds, who've experienced this identical issue. Some of which have take their car to GM who has concluded according to post of experiences on edmunds that they were unable to determine the source of the problem or repair it. This is a problem that require immediate attention. I can't imagine how differently this could have gone should my wife have been going 75 mph on interstate 80. We live along I-80 and travel it frequently. However as a result of this problem we are essentially unable to trust our vehicle beyond about 50 miles per hour.

- Bettendorf, IA, USA

problem #38

Mar 032014


  • 150,000 miles
The contact owns a 2008 Chevrolet Impala. The contact stated while traveling at any speed, the sensor illuminated for reduced power intermittently. The contact stated that the acceleration pedal had to be engaged as the speed reduced without warning. The vehicle was taken to an authorized dealer who reset the code and the failure recurred. The vehicle was further diagnosed by a dealer that the throttle body sensor needed to be replaced. The vehicle was scheduled to be repaired. The VIN was not available. The manufacturer was notified of the failure. The approximate failure mileage was 150,000.

- Eureka, IL, USA

problem #37

May 032014


  • 155,000 miles
When driving through St. Louis around midnight on I-270 on May 3, the "engine power is reduced" message came on and the car slowed dramatically right in the middle lane of the interstate. Quite scary indeed, not to mention the lurching. After being nearly run over on both sides, I pulled off in a very dark part of town and the police came by to check on me. Initially the car wouldn't start with the message, "starting is disabled, service throttle." After about an hour, the thing allowed me to start it, but still with the "power is reduced" message. I actually drove that thing home (over 90 miles) with semis bearing down on me, alternating flashers and watching over my shoulder. Anyway, the next day, it still wouldn't run normally, but I limped over to an autozone and I replaced the throttle assembly and the throttle body (the engine code said P0651, but that was a waste of $300). No help, same message. I let the car sit. When it first started up, still had the message. But about 5 minutes later, the car started normally!!! the check engine light is on now, but those codes haven't been accurate so far. While the car was running normally, I went out and jiggled all the wiring both under the dash and above the throttle, but could not find a loose wire or get the car to shift into the "engine power reduced" message. I also tapped on and jiggled the air box (because I was told that's where the ECM is located). Still couldn't get it to go bad. Came back out the next time and the car had the "engine power is reduced" message and running horribly. I was fortunate not to be killed, these cars are moving chicanes. I am totally at a loss as to what is going on. GM service reps say "go to the dealer" but online shows this only results in a bunch of expensive replaced parts that didn't fix the problem. I only suffered a backache but this car is an accident waiting to happen.

- Altamont, IL, USA

problem #36

Jun 042013


  • 61,390 miles
I own a 2008 Chevy Impala which has been having computer problems for 1 yr now. It reads out reduced engine power and the car wont go faster than 40 mph. Ive had it fixed but then comes right back up, one mechanic says to clean the throttle and another says its sensors. This is becoming quite a problem and nobody can fix it permanently. It is a serious saftey issue due to the fact that I Transport grandchildren around and the car looses power out of nowhere, then just shuts down in the middle of traffic. I cant keep paying all this money for it to just happen over and over with no results. When is this going to be on the recall list" I went online to find out there are alot of other people having the same exact issue. Please help me" I cant afford to keep paying for this when its never actually been fixed. I have no problem paying to have my car fixed but I do when I have to pay over and over again and its still not fixed.

- Lockport, NY, USA

problem #35

May 032014


  • 60,000 miles
Driving down highway when check engine light and "engine power reduced" appeared on my dash. Soon after my speed and power was cut from 70 mph to under 40. I got another message saying "service throttle disabled" and my car lost all ability to accelerate and steer. I was forced to pull over and waited until it started up again. This is a dangerous flaw that is happening to many GM owners. Please recall for everyone's safety.

- Collegeville, PA, USA

problem #34

May 042014

Impala 6-cyl

  • 90,000 miles
I have had many problems with the engine power being reduced due to code 2135, it's a throttle position problem that has happened maybe 50-100 times over the past year. I can clean the throttle plate and it'll be fine for a few days, but is getting progressively worse. It is very dangerous when the car's power is reduced so quickly, especially on freeways. I've nearly been rearended a few times now. I've complained to Chevrolet and they only say there isn't a recall and to take it to the dealer for service. I've contacted the dealer and was told they'd clean the throttle body, which is what I am doing. There needs to be a recall for safety's sake, this is a very deadly problem that they need to address. It's not the consumer's fault at all. Thank you.

- Cologne, MN, USA

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