P0118

PPowertrain

Engine Coolant Temperature Sensor Circuit High

What does this code mean?

Severity : Medium

P0118 indicates high voltage on engine coolant temperature sensor circuit 1. The engine control module reads this as a very cold engine, which is usually wrong. This upsets fuelling, idle speed and cooling fan control, and the fan is often forced on as a precaution.

Symptoms

Check engine light on.
Cooling fan running constantly.
Incorrect temperature gauge reading.
Hard hot starts or higher fuel consumption.
Possible black smoke.

Possible causes

Faulty coolant temperature sensor.
Unplugged or corroded connector.
Open wiring or open sensor ground.
Engine control module fault, which is rare.

Diagnosis and repair

Inspect the sensor connector and wiring.
Compare the reading in live data with actual engine temperature.
Measure sensor resistance with a multimeter.
Check signal and ground continuity back to the module.
Replace the sensor if needed, clear the code and road test.

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Code details

Code

P0118

Related services

Stage 1 · Engine optimization

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