The contact owns a 2018 Ford F-150. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, however, the vehicle failed to accelerate as intended. The transmission independently downshifted into first gear. The vehicle was uncontrollable and crashed into the median. The contact stated the failure was persistent and had occurred several times. In addition, the contact stated that the vehicle sometimes jerked forward and hard-shifted. The vehicle was taken to the dealer where it was diagnosed with a failed transmission. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The contact was informed of an unknown recall of the transmission, however, the contact did not receive updates regarding the repair. The manufacturer was made aware of the failure but did not assist. The failure mileage was approximately 89,000.