Noises During Shifting problems of the 2013 Chevrolet Silverado

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.