On certain vehicles, the front axle shafts may not have been installed properly. As a result, the front axle shaft(s) could become damaged and/or separate from the transmission, and cause a sudden loss of power to the wheels. Additionally, if the vehicle is parked and the parking brake isn't applied, the vehicle could roll away.
A loss of power to the wheels could increase the risk of a crash. A parked vehicle that moves suddenly could create a risk of a crash or an injury.
Ford will notify owners by mail and advise you to take your vehicle to a dealership to inspect and, if necessary, replace the axle shaft(s).