P0118 Code - Engine Coolant Temperature Circuit High Input

What Does P0118 Mean?

The Engine Coolant Temperature Sensor measures the rise and fall of the Engine Coolant Temperature. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, the cooling fans, and many components of the Emissions Control Systems. The Engine Coolant Temperature Sensor converts the coolant temperature into a voltage that is high when the engine is cold and low as the engine warms up.

Code P0118 indicates a high voltage input from the Coolant Temperature Circuit to the PCM.

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What are the common causes of P0118 ?

• Bad connection at the sensor
• Short in the voltage feed between the sensor and ECM/PCM
• Defective ECM/PCM (not likely)
• Defective ECT sensor (shorted internally)

What are the symptoms of P0118 ?

Symptoms of a P0118 could include:

• Very poor fuel economy
• A no start condition
• Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
• Illumination of MIL

How do you troubleshoot P0118 ?

• Repairing or replacing the ECT connector
• Repairing or replacing the wiring open circuit as necessary
• Replacing the ECT with a new sensor

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