"The software calibration for the fuel cutoff functionality in the engine control module is too sensitive," said NHTSA. "Sudden engine stall could occur, increasing the risk of a crash."
"The engine idle speed may drop, resulting in a sudden engine stall without any prior warning," it said. "If this condition occurs, the transmission control unit will enter a temporary protection mode in order to prevent damage to the vehicle's transmission. When starting the vehicle again, the driver can operate the vehicle safely home or to an authorised Volvo repair facility, but may experience a louder than usual transmission and a harder gear engagement."
