P0126
Powertrain Codes
P0126 - Insufficient Coolant Temperature for Stable Operation
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat
When 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.
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.
Information For Specific Makes
P0126 ISUZU
P0126 MAZDA
P0126 SUBARU