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P0115 Lexus Code - Engine Coolant Temperature Circuit Malfunction

Quick Answer

The P0115 diagnostic trouble code for a Lexus indicates an issue with the engine coolant temperature circuit. Common causes include Faulty engine coolant temperature sensor, Wiring issues or poor connections in the coolant temperature sensor circuit, ECM software issues. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0115 Lexus indicates Engine Coolant Temperature Circuit Malfunction.
Common causes
Common causes include Faulty engine coolant temperature sensor, Wiring issues or poor connections in the coolant temperature sensor circuit, ECM software issues.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0115 Lexus Description

The P0115 diagnostic trouble code for a Lexus indicates an issue with the engine coolant temperature circuit. This code is triggered when the Engine Control Module (ECM) detects that the engine coolant temperature sensor signal is outside the expected range. The engine coolant temperature sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the ECM.

OBDII Code P0115 Lexus - Engine Coolant Temperature Circuit Malfunction
P0115 Lexus Code - Engine Coolant Temperature Circuit Malfunction

Common Causes of P0115 Lexus

  1. Faulty engine coolant temperature sensor
  2. Wiring issues or poor connections in the coolant temperature sensor circuit
  3. ECM software issues
  4. Low coolant levels
  5. Thermostat malfunction

Symptoms of P0115 Lexus

  1. Check Engine Light illuminated
  2. Engine running too hot or too cold
  3. Poor fuel efficiency
  4. Engine misfires
  5. Difficulty starting the engine

How to Fix P0115 Lexus

  1. Begin by diagnosing the issue with a scan tool to confirm the P0115 code.
  2. Inspect the engine coolant temperature sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance with a multimeter to ensure it is within the manufacturer's specifications.
  4. If the sensor is faulty, replace it with a new one and clear the code.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the code does not return.

Cost to Fix P0115 Lexus

The cost of repairing a P0115 code on a Lexus can vary depending on the specific issue and the labor rates in your area. On average, replacing the engine coolant temperature sensor can cost between $100 to $200, including parts and labor. Additional costs may apply if other components need to be replaced or if further diagnosis is required. It's recommended to consult with a professional mechanic for a more accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for P0115 Lexus

Start by checking the engine coolant level at the coolant reservoir, a low level may indicate a coolant leak. If the coolant level is correct, you should replace the Engine Coolant Temperature (ECT) sensor to fix the problem. The Engine Coolant Thermostat must be replaced every time there is a repair with the coolant system.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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