Conditions for Setting the DTC

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The ECM detects that the minimum ECT of 55°C (131°F) has not been met with a start-up IAT colder than 10°C (50°F).
The ECM detects that the minimum ECT of 80°C (176°F) has not been met with a start-up IAT warmer than 10°C (50°F).