The contact owns a 2022 GMC Sierra 3500. The contact stated that while driving at unknown speeds, the transmission downshifted hard. The contact stated that the transmission failed to properly shift gear. There were no warning lights illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 24V797000 (Power Train); however, the VIN was not included. The vehicle was taken to the local dealer who was unable to determine the cause of the failure. The vehicle was not diagnosed or repaired. The manufacturer was contacted and opened a case. The failure mileage was approximately 117,000.