Transmission down shifts multiple gears when I decelerate. The first occurrence happened at 70 mph causing a very hard deceleration and near loss of control of the truck. I have had three other like incidences at speeds between 45 and 70 mph. These happened on dry pavement and I was able to slow safely. Had this occurred on wet or snow covered roads, I have no doubt there would have been an accident. 2. at times when I accelerate there is no throttle response for several seconds. When the engine does respond, the truck accelerates as if I have the throttle floored. Again this has happened on dry pavement. Slick conditions would have caused a spin out. 3. vehicle surges between 20 and 45 mph. Engine RPM continually jumps 200-300 RPM causing constant surging. Besides being very annoying, it would be dangerous on icy roads.

- Kennewick, WA, USA

The contact owns a 2013 Chevrolet Silverado 1500. The contact stated that while parked on an incline, the vehicle erroneously shifted out of park and into neutral, made a clucking noise and suddenly shifted into drive. The failure was experienced numerous times. The vehicle was taken to the dealer where the failure could not be diagnosed. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure mileage was 5,300 and the current mileage was 5,500.

- Columbiaville , ME, USA