Ford is recalling more than 220,000 pickup trucks in Canada because the transmissions can suddenly downshift into first gear.
The recall covers F-150 trucks from the 2011 through 2013 model years with six-speed automatic transmissions.
It cover a million-and-a-half trucks, including 1.26 million in the U.S.
The company says a glitch in sending a signal from the transmission speed sensor is the cause.
Ford has five reports of accidents including one that caused a whiplash injury from a sudden downshift.
Owners will be notified by letter starting March 4.
Dealers will update the powertrain control software to fix the problem.
Ford's F-Series pickup is the top-selling vehicle in both Canada and United States.