The U.S. National Highway Traffic Safety Administration (NHTSA), which upgraded its probe into the issue in February, said on Friday that its "investigation of the shifter in these vehicles showed it is clearly a safety issue that has led to hundreds of crashes and dozens of injuries. Fiat Chrysler said it will update the vehicles to automatically prevent them from moving, under certain circumstances, even if the driver fails to put the vehicle in park. Fiat Chrysler did not say when the recall remedy will be available.