Conditions for Setting 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 ECM detects a temperature difference between the ECT sensor and the IAT sensor of greater than 100°C (180°F) at start-up.
OR
The ECM detects a temperature difference between the ECT sensor and the IAT sensor that is greater than 15°C (27°F) and the time elapsed cranking the engine without starting is greater than 5 seconds.
OR
The ECM detects a temperature difference between the ECT sensor and the IAT sensor that is greater than 15°C (27°F). The vehicle must then be driven for 5 minutes over 40 km/h (25 mph). If the IAT sensor temperature decreases greater than 5°C (9°F), an engine block heater was detected and the test is aborted. If the IAT sensor temperature does not decrease, an engine block heater was not detected and DTC P0116 will set.