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P0118 - Engine Coolant Temperature Circuit High Input

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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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
What does this mean? What does this mean?
When is the code detected?
An excessively high voltage from the sensor is sent to ECM.
Possible 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 Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 AUDI Engine Coolant Temperature Circuit High
P0118 BMW Engine Coolant Temperature Sensor 1 Circuit High
P0118 BUICK Engine Coolant Temperature Circuit High Input
P0118 CADILLAC Engine Coolant Temperature Circuit High Input
P0118 CHEVROLET Engine Coolant Temperature Circuit High Input
P0118 CHRYSLER Engine Coolant Temperature Sensor Circuit High
P0118 DODGE Engine Coolant Temperature Sensor Circuit High
P0118 FORD Engine Coolant Temperature Sensor Circuit High
P0118 GMC Engine Coolant Temperature Circuit High Input
P0118 HONDA Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 HYUNDAI Engine Coolant Temperature Circuit High Input
P0118 INFINITI Engine Coolant Temperature Sensor Circuit High
P0118 ISUZU Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 JAGUAR Engine Coolant Temperature Circuit High Input
P0118 JEEP Engine Coolant Temperature Sensor Circuit High
P0118 KIA Engine Coolant Temperature Sensor 1 Circuit High Input
P0118 LEXUS Engine Coolant Temperature Circuit High Input
P0118 MAZDA Engine Coolant Temperature Circuit High Input
P0118 MERCEDES-BENZ Engine Coolant Temperature Circuit High Input
P0118 MITSUBISHI Engine Coolant Temperature Sensor High Input
P0118 NISSAN Engine Coolant Temperature Sensor Circuit High
P0118 PONTIAC Engine Coolant Temperature Circuit High Input
P0118 SATURN Engine Coolant Temperature Circuit High Input
P0118 SCION Engine Coolant Temperature Circuit High Input
P0118 SUBARU Engine Coolant Temperature Circuit High Input
P0118 TOYOTA Engine Coolant Temperature Circuit High Input
P0118 VOLKSWAGEN Engine Coolant Temperature Circuit High
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Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard What does this mean?
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