Heat Protection Power Transfer Unit
WARNING: This page is about a different car, the 2014 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
During off-road operation or heavy trailer towing the AWD system may implement a heat protection mode to protect the power transfer unit from damage. The AWD system will reduce commanded torque to half as the temperature approaches its limit. Once the temperature limit is reached, then 2WD only is commanded.
For concerns with the AWD system or ATC (Active Torque Coupling),
Refer to: FOUR-WHEEL DRIVE SYSTEMS .