The contact owns a 2021 Ford Expedition. The contact stated while driving 10 MPH, the vehicle became stuck in first gear. The driver was able to maneuver the transmission into fourth gear. The contact turned the vehicle on and off, and the transmission was reset. There were no warning lights illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 20V197000 (Power Train). The vehicle was taken to the local dealer, and was diagnosed with CDF drum failure, and that the transmission needed to be rebuilt or replaced. The vehicle was not repaired. The vehicle was taken to an independent mechanic, who determined that the transmission needed to be rebuilt. The manufacturer was contacted and referred the contact to the NHTSA Hotline. The failure mileage was approximately 78,000.