The contact owns a 2009 Pontiac G5. While driving various speeds, the vehicle would suddenly lose power before stalling. The failure occurred on multiple occasions. The contact also indicated that when lifting off the accelerator pedal, the vehicle would not respond for approximately 2 to 3 seconds and the speed would remain the same before the vehicle would decelerate. The vehicle was taken to an independent mechanic who diagnosed that the crank sensor was faulty. The crank sensor was replaced, but the failure recurred. The contact examined the vehicle and discovered that the crank sensor connector wire was faulty. The vehicle was not repaired and the manufacturer was not notified. The failure mileage was 87,000.

- Panther , WV, USA

I was presented with the unsafe condition of being unable to turn the key in my ignition to shut off the vehicle. I attempted turning the key to the off position and it would not move. I repeatedly shifted the car from park to drive and turned the steering wheel in an attempt to loosen the key. My attempts also included enlisting the help of my wife to make sure I was trying to shut the car off correctly. After 30 minutes of idling in the driveway, I pulled the fuel pump relay to starve the vehicle of fuel and it shut off with the key still stuck in the run position. I then disconnected the battery to shut off the lights. I had a spare set of keys so I locked the car doors in my driveway with the keys still in the ignition. The following morning, I called my employer and notified them I would be unable to get to work. I then unlocked the doors with my spare keys, reconnected the battery, and took my car to martin Chevrolet in saginaw, Michigan. Upon arriving I was again unable to shut the vehicle off and it idled while I was checked in. She informed me that this was a common problem with the Chevrolet cobalt and Pontiac G5 vehicles. Faced with no other option but to have my vehicle fixed, I paid the dealership to replace the cylinder (02188-pck) and provide me with a new key. The unsafe condition of being unable to shut off a running vehicle is unacceptable. I have done several searches online and this appears to be a common problem with Chevy cobalts and Pontiac G5 vehicles. GM has also released a technical service bulletin (#09-02-35-005B) reporting this problem for vehicles produced before April 2009. They have also released a newly designed ignition lock cylinder to eliminate this problem and I believe it should be fixed under their powertrain warranty or a recall.

- Saginaw, MI, USA

[xxx] on or about 8:50 P.M. on Saturday November 28, 2010, my wife [xxx] rochester, NY 14624 [xxx], was approaching a parking space in front of the dollar tree in South towns plaza, henrietta, NY at approximately 5 mph, coasting to a stop with her feet on neither the gas nor brake pedal, when our 2009 Pontiac G5 NY license [xxx], lurched out of control, jumped over the median curb in front of the parking space, so fast that the car became momentarily air born, and struck the concrete base of what was once either a stop sign or lamp post in the South towns parking lot. Had it not been for the median and the concrete pillar between the parking space and the dollar tree store front, the GM Pontiac G5 would have plowed through the dollar tree store front full of christmas shoppers on the day after black Friday, perhaps killing my wife and many, many dollar tree christmas shoppers. The resulting unavoidable accident caused significant damage to the driver's side door, caving it in almost a foot, and denting the driver's side rear quarter panel. This car has a 2.2 litre, 155 horse power engine, you cannot intentionally step on the accelerator so hard, in such a short distance, that it will jump a median curb, become air born, and strike a concrete pillar with such force that it will cave in the driver's side door, causing such damage. GM inspected the vehicle and blamed the sudden catastrophic acceleration on the car's after market floor mats. GM refuses to pay for the damage to the car, still under warranty, and refuses to consider that this may be one of the thousands of auto industry wide incidents of intermittent problems with the electronic control modules in the vehicle. GM claims to have run sufficient tests on the car to determine that the ECM is wholly safe and without problems. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Rochester, NY, USA