The contact owns a 2014 Ford Fusion. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted. There was no warning light illuminated. The vehicle was taken to an independent mechanic and was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 39,112.