Vehicle will suddenly throw ABS/traction control/brake system/airbags failure notices; vehicle then goes into limp mode and the transmission locks into first gear. Has occurred 3 times, dealership unable to diagnose or repair. They have cleared all mil/dtc codes and re-flashed ECM 3 times. The problem has occurred once on the interstate in heavy traffic at 70mph and twice on city streets in rush hour traffic, with significant chance for accident/crash. When the vehicle exhibits this condition, loss of control occurs, as engine delivers no power to transmission and car is limited to 25mph maximum speed.

- Louisville, KY, USA

The transmission on my 2009 G8 (6K miles) is very rough shifting especially when cold. When trying to stop, the transmission frequently hesitates to down shift, remaining in the higher gear. If the driver doesn't pay attention and apply constant pressure on the brakes, the car will continue to move forward into the intersection uncommanded. If the driver lets off the brake before the downshift occurs, the car will accelerate dangerously. The dealer applied a technical service bulletin on this issue before I took deliver, but it has not resolved the issue. * * * this is a dangerous, potentially life threatening problem! * * *

- Miramar, FL, USA

Automatic transmission fails to immediately downshift when accelerating to merge into traffic, leaving car and driver in precarious predicament with today's highway speeds. Transmission also causes a vibration when speed decreases and causes dod to be implemented. Dealer has no solution.

- Spartanburg, SC, USA

Transmission fails to downshift immediately after accelerating, leaving driver in vulnerable position of being slow to merge into traffic as anticipated. This action is a daily occurrence since car purchased.

- Spartanburg, SC, USA