Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The TCM has detected an internal overtemperature condition greater than 142°C (288°F) for 2 seconds.
The ignition voltage is greater than 18V and the TCM temperature is greater than 50°C (122°F).