TL* THE CONTACT OWNS A 2011 FORD EXPLORER. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 40 MPH, THE STEERING WHEEL LOCKED AND THE STEERING WARNING INDICATOR ILLUMINATED. THE CONTACT SUDDENLY CRASHED INTO THE PROCEEDING VEHICLE. THERE WERE NO PERSONAL INJURIES. THE VEHICLE WAS DRIVEN TO AN AUTHORIZED DEALER WHERE THE RADIATOR, FRONT BUMPER AND GRILL WERE REPLACED. THE TECHNICIAN WAS UNABLE TO DETERMINE THE CAUSE OF THE STEERING MALFUNCTION. THE MANUFACTURER WAS NOTIFIED OF THE DEFECT. THE APPROXIMATE FAILURE MILEAGE WAS 15,000.