The contact owns a 2015 Ford F-150. The contact stated that while driving approximately 70 MPH, the transmission unexpectedly downshifted from 5th gear to 2nd gear, causing the vehicle to abruptly decelerate. During the failure, the driver almost lost control of the steering wheel and the rear wheels locked up and the vehicle skidded. The contact stated that while driving at various speeds, the failure recurred, and the wrench icon was displayed. The cause of the failure was not yet determined. The local dealer and manufacturer were notified of the failure, but no assistance was offered. The contact was made aware of NHTSA Action Number: PE25002 (POWER TRAIN). The contact stated that the vehicle had experienced the failure listed in the NHTSA Action Number. The failure mileage was 202,000.