Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor is less than 12°C (54°F) at engine start.
The ECT and the IAT are between 10°C (50°F) and 35°C (95°F) at engine start.
DTC P0453 runs once per drive cycle when the above conditions have been met.