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P0118 2017 Toyota RAV4 Code - Engine Coolant Temperature Circuit High Input

Quick Answer

The P0118 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit registering a high input. Common causes include Faulty ECT sensor, Wiring issues or corrosion in the ECT sensor circuit, Low engine coolant level. 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
P0118 2017 Toyota RAV4 indicates Engine Coolant Temperature Circuit High Input.
Common causes
Common causes include Faulty ECT sensor, Wiring issues or corrosion in the ECT sensor circuit, Low engine coolant level.
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 17, 2024
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Code P0118 2017 Toyota RAV4 Description

The P0118 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit registering a high input. The ECT sensor is a crucial component that monitors the temperature of the engine coolant, providing data to the engine control module (ECM) to adjust fuel delivery and ignition timing for optimal performance. When the ECT sensor detects a high input, it means that the engine coolant temperature is higher than expected, which can lead to various issues affecting the vehicle's performance.

OBDII Code P0118 2017 Toyota RAV4 - Engine Coolant Temperature Circuit High Input
P0118 2017 Toyota RAV4 Code - Engine Coolant Temperature Circuit High Input

Common Causes of P0118 2017 Toyota RAV4

  1. Faulty ECT sensor.
  2. Wiring issues or corrosion in the ECT sensor circuit.
  3. Low engine coolant level.
  4. Thermostat malfunction.
  5. ECM software or hardware problems.

Symptoms of P0118 2017 Toyota RAV4

  1. Check engine light illuminated on the dashboard.
  2. Engine running hotter than normal.
  3. Decreased fuel efficiency.
  4. Engine misfires or rough idling.
  5. Poor acceleration or loss of power.

How to Fix P0118 2017 Toyota RAV4

  1. Begin by diagnosing the issue using an OBD-II scanner to confirm the P0118 code and identify the specific cause.
  2. Inspect the ECT sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
  3. Check the engine coolant level and top it off if low. Inspect for any leaks in the cooling system.
  4. Test the thermostat to ensure it is functioning correctly. Replace if found faulty.
  5. Clear the DTC and reset the ECM to see if the code reappears after repairs. Test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0118 2017 Toyota RAV4

The cost of repairing a P0118 code on a 2017 Toyota RAV4 can vary depending on the specific cause of the issue. In general, replacing the ECT sensor can cost between $50 to $150, while addressing wiring or thermostat problems may increase the total repair cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total cost can be estimated to be around $150 to $300 for parts and labor. However, prices can fluctuate based on location, dealership rates, and the extent of the repairs needed. It's recommended to consult with a professional mechanic for a more accurate cost estimate.

What does this mean?

Tech Notes for P0118 2017 Toyota RAV4

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.

Frequently Asked Questions about P0118 2017 Toyota RAV4 Code

1. What does OBDII code P0118 on a 2017 Toyota RAV4 mean?

The code P0118 indicates an issue with the Engine Coolant Temperature (ECT) sensor circuit, specifically signaling a high input reading.

2. What are the common symptoms of OBDII code P0118 in a 2017 Toyota RAV4?

Common symptoms include the engine running hotter than normal, poor fuel economy, rough idling, and the Check Engine light illuminating on the dashboard.

3. What are the possible causes of OBDII code P0118 in a 2017 Toyota RAV4?

Potential causes of code P0118 include a faulty ECT sensor, a malfunctioning thermostat, wiring issues in the ECT circuit, low coolant levels, or a problem with the engine control module (ECM).

4. How can I diagnose the OBDII code P0118 in my 2017 Toyota RAV4?

To diagnose P0118, you can use a scan tool to check the ECT sensor readings, inspect the wiring for any damage, test the thermostat, and verify coolant levels in the system.

5. Can I continue driving my 2017 Toyota RAV4 with OBDII code P0118?

It's not recommended to drive with code P0118 as it can lead to overheating issues and potential engine damage. It's best to address the problem promptly.

6. How can I repair OBDII code P0118 in my 2017 Toyota RAV4?

Repairing P0118 may involve replacing the ECT sensor, fixing any wiring issues, checking and replacing the thermostat if necessary, and ensuring the coolant system is functioning correctly.

7. Will resetting the Check Engine light resolve OBDII code P0118 in my 2017 Toyota RAV4?

Resetting the light may temporarily turn it off, but it won't fix the underlying issue causing code P0118. It's crucial to diagnose and address the problem to prevent further issues.

8. How much does it typically cost to repair OBDII code P0118 in a 2017 Toyota RAV4?

The cost of repairing P0118 can vary depending on the root cause of the issue. It may range from replacing a faulty sensor (around $50-$200) to addressing more complex wiring or ECM problems.

9. Can a DIY enthusiast fix OBDII code P0118 in a 2017 Toyota RAV4?

Depending on the cause, DIY enthusiasts with some mechanical knowledge may be able to replace the ECT sensor or check basic wiring. However, more complex issues may require professional help.

10. Is OBDII code P0118 a serious problem in a 2017 Toyota RAV4?

While P0118 is not an emergency, it should be addressed promptly to prevent potential overheating and engine damage. Ignoring the issue can lead to more severe problems down the line.

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