DETROIT (AP) — Ford is recalling more than 550,000 pickup trucks in the U.S. because the transmissions can unexpectedly downshift to first gear no matter how fast the trucks are going.

The recall covers certain F-150 pickups from the 2014 model year.

Ford says in documents posted Tuesday by U.S. safety regulators that the downshifting can cause drivers to lose control of the trucks, increasing the risk of a crash.

Documents say the problem is caused by a lost signal between a transmission speed sensor and the powertrain control computer.

There also could be corrosion and problems with connector pins.

Dealers will update the powertrain control software at no cost to owners, who will be notified by letters in early July.

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