Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The TAC motor output current is more than 8 amps for less than 1 second.
Or
The temperature of the TAC motor driver circuit is more than 175°C (347°F) for less than 1 second.