Driving from a side road onto the 505 freeway, vehicle came to a stop on the slow lane. Was towed to a Cadillac dealer. 1/6/14. Replaced left and right catalytic converter. Second incident occurred 1/27/2014. Driving onto I-80. Exact problem occurred and was towed to same Cadillac dealer. Dealer adjusted throttle body. Am concerned if problem has been resolved..

- Dixon, CA, USA

While traveling at a slow speed on a wet road, the driver had difficulty shifting gears. The vehicle began to shake violently and lunged hard to the right (the driver was unable to correct or control). For unknown reasons, the vehicle then accelerated to a high speed and crashed into two trees. The accident might have been initiated by a malfunctioning electronic stability control (ESC) system, causing unexpected braking action and pulling to the right. Other malfunctioning electronic sensors and/or associated vehicle control modules, known transmission problems (harsh or unexpected transmission shifts: Tsb 02-07-30-013E), or suspension components problems (rear axel or wheel hop: Tsb 05-04-114-001A) could have been contributing factors.

- Ashburn, VA, USA

The contact states when pulling into a parking space the vehicle lunged forward. She went over an embankment and knocked down a street sign. There was a police report taken. The vehicle is currently at a body shop, and will be towed to the dealership for inspection after it is repaired. Both the driver and passenger had bumps and scrapes. The vehicle lunged a previous time, approximately one week ago when she was making a right turn. The vehicle was not taken to the dealership at that time.

- Parkville, MD, USA