The official notice
Defect
On certain vehicles, a software problem could cause the powertrain control module (PCM) to reset while driving. If this happens, the parking pawl could become damaged. As a result, when the transmission is shifted to Park, the vehicle could move if the parking brake is not applied. Additionally, under certain conditions, there could be a loss of power to the wheels. Note: This recall only affects certain vehicles equipped with a 2.3 L engine.
Safety Risk
A parked vehicle that rolls away could create the risk of an injury or a crash. A loss of power to the wheels could increase the risk of a crash.
Remedy
Ford will notify owners by mail and advise you to take your vehicle to a dealership to update the powertrain control module (PCM) software. The dealer will also inspect and, if necessary, replace the transmission.