2008 Pontiac Grand Prix: check engine light

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 Jun 24, 2015 · Acceleration · 105,000 miles · MI

Driving on the highway or anywhere, it happens every other day. The information message center chimes then the check engine light comes on the car slows down to 25mph. When I am on the highway this is very dangerous. I have taken it to 3 different service stations, the last 2 dealerships. All the codes are throttle related and I get the car back after a week or 2 and the same thing happens again. No one can fix it. I have emailed gm they did not respond to my email. I attached all the service records with the email hoping they would be able to help. Slowing me from 70mph down to 25mph on the highway (us131) will cause an accident sooner not later. Its only a matter of time before this happens. Gm doesn't seem to care. I'm not sure what to do, no one can fix the car and I'm running out of money for repairs.

Filed Sep 29, 2014 · Acceleration, Airbags · 92,000 miles · TX

I was driving on the highway and exiting on a ramp. The ramp was on an incline. My driving speed around 45 MPH. Then, unexpectedly, the speed decreased to 30 MPH and immediately the "reduce engine speed" light came on. Shortly after, my "check engine" light came on. I continued on my exit, pulled over and parked. After car being off for 30 minutes, the car started right back up. The "reduce engine speed" light went off but the "check engine" light remained. I purchased my car in feb 2014 and this was the very 1st incident. In the beginning, this wasn't frequent but as I noticed it happening more often, I began to record each time this happened. The dates I have tracked thus far are 7/7/14, 7/10/14, 7/13/14, 7/27/14, 8/2/14, 8/11/14, 8/12/14, 8/20/14, 8/21/14, 8/22/14, 8/28/14 (happened 3 times throughout the noon at 2:15p, 3:00p & 5:20p), 8/29/14, 9/9/14, 9/10/14 (4 times throughout this day), 9/15/14, 9/16/14, 9/17/14, 9/18/14, 9/19/14, 9/20/14, 9/23/14, 9/24/14, 9/27/14. I have already had $550 repairs done, at least that's what I thought, to take care of the "reduce engine speed" light but it continues to come on. I took it back the same mechanic/body shop and the diagnostic machine showed more/different codes. New repairs would cost another $550-$600. Also, when either of my sons sit in the front seat, the passenger airbag light goes on and off. They are both between 90-95 lbs. This are major concerns because I need to know that we are safe whenever we are inside the vehicle.

Filed Jul 13, 2014 · Engine · 55,000 miles · OH

Accelerated to on ramp of expressway, reached approximately 60 MPH. Vehicle immediately decelerated. I pulled off to the side of the expressway and turned the car off. Attempted to turn car back on. It did not turn over. Battery was ok, engine was not. Car had to be towed to service center. Ignition control module, ignition coils, spark plug wires replaced. Hefty repair bill. One week later, accelerated to on ramp, reached 70 MPH, car jerked as I attempted to increase speed. Check engine light flashed rapidly twice. Got off expressway, reached speeds up to 40 MPH. Possible catalytic converter to be replaced. Both situations could have LED to serious injuries.

Filed May 22, 2014 · Engine, Fuel system · NC

Eval hose caused my check engine light to come on. Got it fixed and tested and same diagnose was popping up. Check engine light is still 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.

Filed Jul 11, 2012 · Engine · 68,550 miles · IA

Tl* the contact owns a 2008 pontiac grand prix. The contact stated that the check engine light illuminated. The vehicle was taken to the local mechanic, who performed a diagnostic test which located the failure at the air injection pump. The air valve failed due to water damage. The air injection pump and air valve were replaced. The contact felt that the repair was not going to permanently correct the failure. The manufacturer was made aware of the failure. The failure mileage was 68,550 and the current mileage was 68,650.

Filed Jan 31, 2011 · Engine · 63,000 miles · MO

Tl*the contact owns 2008 pontiac grand prix. While the contact was driving in approximately 10 MPH, the engine stalled and the check engine light illuminated. The engine restarted and the vehicle resumed normally. The failure occurred again at a different time. The vehicle was taken to an independent dealer where the camshaft sensor and rack and pinion were replaced. The failure occurred one week after the repair so the vehicle was towed back to the independent mechanic. A diagnostic testing was performed which failed to detect a trouble code. The vehicle was taken to an authorized dealer and they performed a fuel induction cleaning which did not remedy the problem. The failure mileage was approximately 63,000. Updated 03/15/11*lj updated 1/3/11

Filed Nov 18, 2010 · Electrical · 39,000 miles · MI

2008 pontiac grand prix, total ignition failure, while driving without warning. Vehicle has only 39000 miles, and was properly maintained. There was no check engine light. Repair was to change ignition module and three coil packs. The fuse was also blown.

Filed Nov 2, 2009 · Engine · 59,800 miles · NY

P-0411 code; air control valve solenoid. My check engine light kept going on and then would go off. This process repeated a few times. Bought new gas cap a few times. Finally, light came on and would not go off. Took it to dealer who told me it was the air control valve solenoid and it was not covered under warranty. After looking into this problem online, it seems that this is not a new problem with these cars. Http://autoforum.classifieds1000.com/pontiac-grand_prix/secondary_air_pump has some listings. If you search secondary air pump; pontiac grand prix cars - you get multiple hits.