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P0126 - Insufficient Coolant Temperature for Stable Operation

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P0126 Comments |  Add Comment
Possible causes
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
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When is the code detected?
The voltage sent to Engine Control Module (ECM) from the sensor is not practical, even when some time has passed after starting the engine.
- Engine Light ON (or Service Engine Soon Warning Light)
P0126 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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