Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The engine has been running and then turned off for at least 60 seconds.
OR
DTC P2453 runs continuously when the engine is running.
AND
DTC P2453 runs once after the ignition has been turned OFF.