The contact owns a 2010 Ford Fusion. The contact stated that while the vehicle was parked and started, the message Power Steering Assist Fault was displayed. The contact stated that the steering wheel was locked. The vehicle was restarted, and the failure was self-corrected. The vehicle was taken to an independent mechanic where it was diagnosed that the power steering control module needed to be replaced or reprogrammed. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 160,000.