Engine-Codes - Generic - P0126

P0126 Code - Insufficient Coolant Temperature for Stable Operation

- Code Popularity: 45,987 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0126?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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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How to Fix the DTC P0126?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0126 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

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.

What are Code Possible Symptoms?

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

What Does the P0126 Code Mean?

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.

P0126 Code - Insufficient Coolant Temperature for Stable Operation

Need more Information on the Code?

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Code P0126 Information for Specific Makes

  • P0126 Isuzu Insufficient Coolant Temperature for Stable Operation
  • P0126 Mazda Coolant Thermostat Condition Low Operating Temperature
  • P0126 Mercedes-Benz Insufficient Coolant Temperature for Stable Operation
  • P0126 Subaru Insufficient Coolant Temperature for Stable Operation

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