The contact owns a 2013 Ford F-150. The contact stated while driving 65 MPH, the transmission unexpectedly downshifted to first gear. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, and informed the contact that the vehicle was already repaired under NHTSA Campaign Number: 19V433000 (Power Train); by the previous owner. The failure mileage was approximately 233,233.