The contact owns a 2011 Ford F-150. The contact stated that while his fiancé was stopped at a stop sign, the vehicle accelerated violently after depressing the accelerator pedal, and the driver lost control of the vehicle. The vehicle continued accelerating while depressing the brake pedal. The contact stated that the vehicle crashed through a yard, into a road sign, before crashing into the rear of a parked vehicle, where the vehicle came to a stop. The contact stated that the air bags failed to deploy upon impact. The driver sustained whiplash and soreness in various parts of the body but had not sought medical attention. A Police report was filed. The road sign was damaged. The driver coasted the vehicle back to the residence before the vehicle was towed to an independent mechanic. A diagnostic test was performed on the vehicle; however, the mechanic was unable to determine the cause of the failure or duplicate the failure. The manufacturer was notified of the failure and provided a case number. The vehicle was not diagnosed or repaired. The failure mileage was approximately 120,000.