The contact owns a 2007 Pontiac Grand Prix. The contact stated that the vehicle failed to accelerate and excessive force was required on the accelerator pedal in order for the vehicle to respond. Also, the contact mentioned that the vehicle vibrated and jerked when the gears were shifted. The failure occurred several times. The vehicle was taken to a dealer. The technician diagnosed that the transmission needed to be flushed. The flush was performed but the failure persisted. The manufacturer was not notified of the issue. The approximate failure mileage was unknown.

- Los Angeles , CA, USA

The issues I have with my 07 Pontiac Grand Prix gxp are the following more often than not now when taking off from a stop transmission revs up and slams into gear causing wheel spin going down highway torque converter will lock up and release at cruising speeds 65-70 mph causing car to buck erratically causing stability issues.

- St. Joseph, MO, USA

The contact owns a 2007 Pontiac Grand Prix. While stopped at a light, the vehicle would not accelerate. The failure recured intermittently. In addition, the speedometer would not read the accurate speed. The vehicle was towed to the dealer where the technician stated that the transmission would have to be replaced. The failure persisted after the repair. The transmission was replaced three different times but the failure persisted. The approximate failure mileage was 20,000.

- Mays Landing, NJ, USA

Went to drive my vehicle from in front of my house and discovered by accident, that I could shift my car into reverse without depressing the brake pedal or pushing in on the pawl button on the shifter. I had gotten a shirtsleeve hung up on the shifter and pulled my arm back and the car started into reverse on its own. This is a constant condition, and I have not made contact with a dealer, though based on my past experiences with GM dealerships, they won't fix it, or will blame me for the condition. This is why I am submitting this report first.

- Springfield, IL, USA

I am experiencing intermittent transmission slipping as well as malfunctioning from a start.

- Howell, MI, USA

2007 Grand Prix gxp car kept triggering engine light and turned out to be codes P0700 and P0843. 135K transmission was rebuilt because reverse had gone. Now @ 193K trans is back to the codes and now slipping. I've had my 99 Grand Prix gtp for 8 years and never had to dump a trans into it or motor into it and its at 176K miles running hard. The trans for this vehicle needs to be redone.

- Wyandotte, MI, USA

Update on 10192218 and 10192426. 2007 Grand Prix gxp dealer attempted repair transmission. Per gms tech support, dealer pulled transmission, replaced final drive gears, and bearings. Problem not resolved. Dealer then replaced transmission, but with GM re-manufactured"part. Also, dealer stated they could not obtain a brand new transmission for any repair because the factory saved new transmissions for the production line vehicles. 15 days at dealer. And was told car ready for pick-up. Drove the car around the parking lot and noticed gear shift did not lock into place in any gear but manual. Reverse, didn't work, and transmission shifted itself into neutral going down an incline. Brought vehicle immediately back to dealer, who had to replace both front Bridgestone tires due to out of round and irregular wear. Latest set of tires were also defective, ordered two new Bridgestone's under warranty. Second set of replacement tires did not help. Dealer told me there was nothing wrong with the replacement transmission, despite drive line shuddering. Dealer stated operated as designed.

- Wesley Chapel, FL, USA

Follow-up on ODI #'s: 10191952 and10192426 repair attempt three on automatic transmission. As of midnight tonight, this makes 15 consecutive days the vehicle has been at the dealer for repair of the transmission. Dealer called today, stating vehicle is repaired. They replaced the transmission with a "re-manufactured" transmission they ordered from GM. So, I've got a brand new 2007 Grand Prix gxp with 3,200 miles on the odometer, with a used transmission from GM. Dealer insisted vehicle had been taken for several test-drives today, and it is in "like new" condition. Upon taking the car for a test drive, myself, I noticed that the gearshift was loose, and did not lock into place, as it had before, and as it was designed to do. Any slight pressure or bump in the road caused this "new"("??") transmission to shift into neutral, without control input from driver. Basically, there were no detent stops for the gear indicator, and it freely moved between drive, neutral and reverse! dealer stated they would once again attempt to repair. Dealer did not close-out the service ticket, so they are making this appear as one repair attempt, even though they have: 1. ignored initial complaint, 2. attempted to repair the original transmission, 3. failing that, they ordered a used, re-manufactured transmission from GM, which has either been installed incorrectly, or is defective from the start. Even if the vehicle can be "repaired", it now has a used, dysfunctional and dangerous transmission, and the car is seriously de-valued. I am filing a complaint with GM, and thoroughly plan on a vigorous pursuit of my rights under the Florida lemon law.

- Wesley Chapel, FL, USA

Update regarding original ODI case number: 10191952. Car has now been in service for ten days. Dealer stated GM "aware of a potential defect" in the transmission, in the final drive gear(s). Dealer replaced two gears and a bearing in the transmission. Pursuant to discussion with dealer representative today, repair did not correct problem. Transmission is now making "clanking" noise at various speeds instead of just at idle. No details received regarding harsh shift, just that dealer felt transmission repair was "unacceptable". dealer has ordered a replacement transmission from GM. Note: Dealer, ferman at cypress creek in lutz, fl has been quite accommodating and rudy schmidt, service director, has made this ordeal much more tolerable. This appears to be a design or manufacturing flaw, which GM did not correct prior to delivery.

- Wesley Chapel, FL, USA

Purchased 2007 Pontiac Grand Prix gxp new, approx 3 months ago. At 500 miles, loud metal-on-metal "clanking" noise began. Traced noise to transmission bell housing. Taken for service at 1,500 miles, requested service writer listen to the noise and take care of problem. Returned as "no problem found". again, took vehicle to dealer for same noise, along with harsh and sudden shifts around 25-30mph. Dealer attempted to return vehicle, stating it was "normal, and covered by a tsb". I refused to accept the vehicle. Dealer gave me a very hard time about covering a loaner vehicle, even though this was 2nd time to dealer with same complaint, unresolved, with just over 3,200 miles on odometer. Dealer called GM. Mechanics now have to tear out the transmission to "attempt a diagnosis". apparently, there may be a "clutch pack issue". vehicle still in service after 4 days, no diagnosis yet. Request GM provide a new transmission and bell housing.

- Wesley Chapel, FM, USA