Possible causes

– Low engine coolant level
– Faulty Engine Coolant Temperature (ECT) sensor
– Faulty engine coolant thermostat
– Engine Coolant Temperature (ECT) sensor harness is open or shorted
– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

When is the code detected?

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

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0118 Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (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.

P0118 Information for specific makes

P0118 ACURA
P0118 HONDA
P0118 BMW
P0118 CHRYSLER
P0118 DODGE
P0118 JEEP
P0118 FORD
P0118 HYUNDAI
P0118 ISUZU
P0118 INFINITI
P0118 NISSAN
P0118 KIA
P0118 LEXUS
P0118 MAZDA
P0118 TOYOTA
P0118 MITSUBISHI
P0118 SUBARU
P0118 JAGUAR
P0118 AUDI
P0118 VOLKSWAGEN
P0118 BUICK
P0118 CADILLAC
P0118 CHEVROLET
P0118 GMC
P0118 PONTIAC
P0118 SATURN