P011A – Engine Coolant Temperature Sensor 1/2 Correlation

P011A Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P011A 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

P011A 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.