The contact owns a 2018 Ford F-150. The contact stated while driving 15â’20 MPH, the transmission independently downshifted into first gear, the vehicle jerked, and lost automotive power. There were no warning lights illuminated. The contact pulled over onto the shoulder and turned off the vehicle. The vehicle was able to restart; however, the failure recurred. The vehicle was taken to an independent mechanic, where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was then taken to the dealer, where it was confirmed that the transmission had failed and needed to be replaced. The vehicle was not repaired due to the cost. The vehicle was taken to AAMCO, where the vehicle was repaired. The manufacturer was notified of the failure but declined to provide assistance. The approximate failure mileage was 80,000.