Heat Protection - Power Transfer Unit

During excessive use when towing a trailer the AWD system may implement a heat protection mode to protect the power transfer unit (PTU) from damage. Using the input from power transfer unit temperature sensors, the PCM performs calculations to determine the demand for use of the heat protection mode. The AWD system then reduces the commanded torque to that deemed suitable. Once the maximum temperature limit is reached, FWD mode only is commanded and the AWD Temporarily Disabled or AWD OFF message is displayed in the IPC.