Conditions for Setting the DTC

The PCM detects a temperature difference between the ECT sensor and the IAT sensor of more than 100°C (180°F) at start up.
OR
The PCM detects a temperature difference at power-up, the ECT is 15°C more than the IAT, and the time spent cranking the engine without starting is more than 10 seconds when the fuel level is more than 10 percent.
OR
The PCM detects a temperature difference between the ECT sensor and the IAT sensor of more 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 more 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.