For announced it is recalling 1.5 million F-150s in North America due to concerns with sudden shifting.

According to reports, transmissions in impacted can suddenly downshift into first gear while driving. Five incidents related to the malfunction have been reported, including one accident that caused a whiplash injury. Representatives from Ford believe a glitch in the signal being sent from the transmission to the speed sensors is the cause of the problems.

The F-Series pickups are the top selling vehicle in the U.S. This recall targets F-150s from 2011-2013 with six speed automatic transmissions.