Ford’s fix is to add a software update that automatically applies the electronic service parking brake to keep the vehicle from rolling away, the agency said, adding there is no remedy to address the failed rear axle horizontal mounting bolt “which is the basis of this safety issue and the cause of the impaired vehicle.”

NHTSA said it has received two complaints alleging a loss of power or transmission torque of the rear wheels in Explorer vehicles that had received the recall fix.

One complaint told NHTSA that after getting the software update “the vehicle would randomly slam to a complete stop while driving. It happened several times with three different drivers (myself, my wife, and my son), each happening at 30-35 mph or less.”