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P0115 2003 Toyota Corolla Code - Engine Coolant Temperature Circuit

- Code Popularity: 11,685 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0115 2003 Toyota Corolla?

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
  • 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
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How to Fix the DTC P0115 2003 Toyota Corolla?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0115 2003 Toyota Corolla code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

An excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

What are Code Possible Symptoms?

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

Code P0115 2003 Toyota Corolla 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.

OBDII Code P0115 2003 Toyota Corolla - Engine Coolant Temperature Circuit - AutoCodes.com
P0115 2003 Toyota Corolla Code - Engine Coolant Temperature Circuit

Need More Information on the Code?

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Code P0115 2003 Toyota Corolla comments

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