2008 Pontiac Grand Prix: sudden loss of power

6 of the 143 complaints about the 2008 Pontiac Grand Prix describe sudden loss of power.

owner complaints: 6
of this car's complaints: 4%
typical mileage: 120,000
recalls: 0

Is there a fix? 118 service bulletins cover this area of the car. See below

Sudden loss of power by model year

2008
6
2007
9
2006
13
2005
12
2004
9
2003
1
2002
3
2001
6
2000
5
1999
9
1998
7
1997
16
1996
2
1993
2
1992
3
1991
1

What owners say

Filed Oct 2, 2025 · Electrical · 194,000 miles · MI

The contact owns a 2008 Pontiac Grand Prix. The contact stated that while driving at various speeds, the ignition switch unintendedly turned off the vehicle, and the vehicle lost power. The contact was able to immediately restart the vehicle. Occasionally, the contact had to wait for several minutes before the vehicle restarted and was able to be driven. The failure had become more persistent over time and the contact became aware that the failure mostly occurred in warmer weather. The contact became aware of the federal safety agency Campaign Number: 14V400000 (Electrical System); however, the VIN was not included in the recall. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 194,000.

Filed Dec 10, 2015 · Steering · 76,000 miles · MI

Had the power steering replaced 3 times in the last 3 years. Talked to others that have the same car they also have the same problem with the power steering unit leaking. My company had several grand prix's as a company car for years they also expressed this was a problem. I've had the lines burst on this unit as well. Also many of them said they didn't fix this they just keep adding fluid weekly. My thought is was thats not good for the environment. I lost all power when the high pressure line burst while going down the express way at 70 MPH. Not cool!

Filed Sep 20, 2015 · Acceleration, Engine · 120,000 miles · TX

Reduced engine light keep coming on while driving and the vehicle lose power when try to accelerate. This has been going on for about 3 years now on and off. We have brought the vehicle to get repaired multiple times and the problem continues. The throttle body has been changed and also sensors but the problem continues.

Filed Aug 28, 2015 · Acceleration, Engine · 133,700 miles · MI

My grand prix recently started to display a message stating reduced engine power. It has been happening randomly for the past week. It only happens as I am driving the car. The car slows dramatically, and does not accelerate at all. As I was driving yesterday, I was merging into traffic where the speed limit is 45 MPH, I had more than enough room to merge into traffic, the reduced engine power message displayed and the car would not accelerate. The traffic quickly caught up to me and I was almost hit due to the car not accelerating. I am curious after looking into this matter and finding so many complaints about the same issue, how many complaints need to be filed, or how many deaths need to occur before something is done? I am now scared to drive my own car.

Filed Jul 28, 2014 · Airbags, Brakes · 92,159 miles · IN

We got this 2008 pontiac grand prix from a second hand dealer that sold 2008 or newer, we were on a lease with this auto we also had a warranty as well. We took a short trip to ohio and we checked into the hotel , went out got into the car was heading to their casino for the night was driving on interstate 75 doing about 72 MPH. While I was in the fast lane I lost all power didn't know what had happen had to try to get the car all the way over to right side of the highway. This was in on june 26,2012 police came I called the warranty company they stated that we would have to have the car towed to a gm dealership so we did, the next morning I got up and called the dealer told them what happen while I was driving the car it cranks and does not start check and please advise. While waiting on them I called the lease company to see what kind of help we could get from them the answer was point blank none was never late on payments with them the car only had 92152 miles on it at this time we got it back in aug.2009. So the dealer called back and told us the the car had a bad ignition control module and coil , this not the killing part we had to pay $705.88 and wow general motors saying they don't have any recalls on this model or year. I have been trying to get reimburse for the amount we paid to have this done, I know that it's a whole lot of people out here that have had some of the same issues that I have had but didn't get them repaired. Other issues (1) power sterring(2) brake lights staying on alot of the time(3)airbag ,and the list goes on.

Filed May 5, 2014 · Airbags, Body · 96,000 miles · MO · crash

A vehicle turned in front of me causing a subsequent crash resulting in front damage to my car. Airbags did not deploy although bumper was torn off and hood bent. Additionally aside from the crash, my car has started losing power while driving. I was driving on the highway when it lost power. I was able to maneuver and get it to the side of the road. It finally restarted. It will not start sometimes. Had the engine light checked and it shows there is a sensor problem. Will not identify which pedal sensor. Frustrated and will not drive it on the highway.