Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 GMC Safari and 2004 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0335, P0336, P0341, P1345 are not set.
The engine coolant temperature (ECT) is more than 65°C (149°F).