Automatic Transmission problems of the 2007 Chevrolet Impala

No signs of failure until put car in park. Tried to put back into drive and shift lever would not move. Read owners manual and tried their recommendation, did not work. Found the ground wire for the btsi had broke do to faulty wiring at factory, yet chevy will not cover the expense. Repair costed $165. 60. If this were to happen in cold temps, an emergency, at a train stop or anywhere like that it could be life threating since their is no override other than tearing apart console to hit the manual reset. Their is also a technical bulletin on this issue, telling me it happens quite frequently.

Car does not shift out of park with brakes applied and ignition on.

At random times, starting from a stop, my 2007 chevy Impala ltz car will slowly engage 1st gear and then suddenly engage with a strong jerk. On several occasions this occurred when pulling out into traffic, starting at a traffic light on a wet road, and pulling up slight inclined driveway into garage. Several of these times I've lost control briefly from movement of the steering wheel, due to the unexpected power of the transmission engaging and jerking. The dealer has made multiple unsuccessful attempts at repairs throughout 2008 until now. From reading all the owner discussions at edmunds. Com I see this is a common problem and a safety issue for me.

The vehicle was turned off, in park, with the parking brake on, in the driveway at an incline. The vehicle rolled backwards down the driveway, and hit the fence which brought it to a stop. There was damage to the driver side door and driver side rear of vehicle. The car was taken to dealer, and the event explained. The dealer made repair to door at my cost. The dealer made no attempt to determine the cause. I called again to service and spoke to someone, who stated that the parking brake is not supposed to prevent the vehicle from rolling backwards. No investigation was offered.

When I am coming from a stop and beginning to accelerate at moderate rate between 5-25 miles my car jerks very hard. The feeling is sometimes to the point it feels as if I have been hit from behind by another car. The feeling is very forceful and it feels as if it begins in under the rear seats and the rear tires. It happens sometimes maybe once or twice a day and other times everytime I press the gas upon coming out of a complete stop and sometimes it does this forceful jerk/thump/shrug consecutively as I come out of the complete stop and then as I accelerate a little more. Have taken it to two certified gm service centers on 3 occasions and told them the problem. And after the last visit the problem has gotten worse. I am concerned as what to do. And the problem is progressively getting worse. It happens daily and on most occasions everytime I stop.