DTC: P0118

Search Bulletins/Recalls for P0118

Trouble diagnosis name: Engine coolant temperature (ECT) sensor circuit high input

Shape may vary for some models

Component Description

The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

DTC detecting condition:

• An excessively high voltage from the sensor is sent to ECM.

Possible cause:

• Harness or connectors (The sensor circuit is open or shorted.)
• Engine coolant temperature sensor may be faulty