Conditions for Running 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 engine is running.
The TCM temperature is between 0-240°C (32-464°F) for 0.25 second or greater.
DTC P0634 has not failed this ignition cycle.
The DTC runs continuously when the above conditions are met.