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DTC Code:

Manufacturer:

P0117

Maker: Acura

Description: Engine Coolant Temperature Sensor 1 Circuit Low Voltage

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 circuit poor electrical connection

When is the code detected?

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


Possible symptoms

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


P0117 Acura 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.

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