The National Highway Traffic Safety Administration is investigating nearly 1.3 million Ford F-150 pickup trucks in the United States over reports of an unexpected gear downshift accompanied by a temporary rear wheel lock-up.

The National Highway Traffic Safety Administration has launched a probe into 1.3 million Ford F-150 trucks from model years 2015 to 2017 over reports of sudden gear downshifts that may cause the rear wheels to lock up.

The National Highway Traffic Safety Administration has opened a preliminary investigation into the Ford F-150, saying almost 1.3 million of the trucks could have an issue that causes an unexpected gear shift and a potential for a rear-wheel lockup.