The problem could affect nearly 1.3 million F-150 trucks. Ford is cooperating with the investigation as the NHTSA determines the scope and severity of the potential issue. No injuries or crashes have been reported in connection with the customer complaints.

The National Highway Traffic Safety Administration is looking into unexpected gear downshifting in 1.3 million F-150 trucks.

Federal regulators have opened an investigation into nearly 1.3 million Ford F-150 trucks after consumers complained the vehicle unexpectedly downshifted while traveling at high speeds, causing it to rapidly slow down and increasing the risk of a crash.