UNDER CERTAIN ENGINE OPERATING CONDITIONS, REPEATED LOW SPEED SHORT TRIP DRIVING AND AMBIENT TEMPERATURES BELOW -25 DEGREES CELSIUS, MOISTURE CONTAINED IN RECIRCULATED EXHAUST GAS CAN FREEZE AT THE BOTTOM OF THE THROTTLE CHAMBER SECONDARY THROTTLE PLATE. IT IS POSSIBLE FOR A PIECE OF ICE TO CAUSE THE SECONDARY VALVE PLATE TO NOT RETURN TO IDLE WHEN THE OPERATOR RELEASES THE ACCELERATOR PEDAL. PS110017424 TO 044399KPS110000029 TO 026828