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Engine-Codes – Honda – P0118 Honda

P0118 Honda Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Quick Answer

The P0118 code for Honda vehicles indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically a high voltage reading. Common causes include Faulty ECT sensor, Wiring or connector issues in the ECT circuit, Corrosion or damage to the ECT sensor wiring. 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 Honda indicates Engine Coolant Temperature Sensor 1 Circuit High Voltage.
Common causes
Common causes include Faulty ECT sensor, Wiring or connector issues in the ECT circuit, Corrosion or damage to the ECT sensor wiring.
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 Aug 19, 2024
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Code P0118 Honda Description

The P0118 code for Honda vehicles indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically a high voltage reading. The ECT sensor is responsible for measuring the temperature of the engine coolant and providing this information to the engine control module (ECM) to help regulate fuel injection, ignition timing, and other engine functions. When the ECT sensor reports a high voltage reading, it means that the engine coolant temperature is higher than expected, which can lead to various performance issues.

OBDII Code P0118 Honda - Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 Honda Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Common Causes of P0118 Honda

  1. Faulty ECT sensor
  2. Wiring or connector issues in the ECT circuit
  3. Corrosion or damage to the ECT sensor wiring
  4. Cooling system problems causing inaccurate temperature readings
  5. ECM malfunction affecting ECT sensor communication

Symptoms of P0118 Honda

  1. Check Engine Light illuminated
  2. Engine running hotter than normal
  3. Decreased fuel efficiency
  4. Rough idling or stalling
  5. Engine misfires

How to Fix P0118 Honda

  1. Begin by verifying the code with a diagnostic scan tool to ensure the issue is related to the ECT sensor.
  2. Inspect the ECT sensor and its wiring for any signs of damage, corrosion, or loose connections.
  3. Test the ECT sensor using a multimeter to determine if it is functioning properly.
  4. Replace the ECT sensor if it is found to be faulty, ensuring the new sensor is installed correctly.
  5. Clear the code and retest the vehicle to confirm that the issue has been resolved.

Cost to Fix P0118 Honda

The cost to repair a P0118 code on a Honda vehicle can vary depending on the specific model and year. On average, replacing an ECT sensor can cost between $50 to $150 for the part, with additional labor costs ranging from $50 to $150. Overall, the total repair cost for this issue may fall between $100 and $300, but it's essential to consult with a trusted mechanic or repair shop to get an accurate estimate based on your vehicle's needs. Labor rates and part prices can differ based on location and the specific circumstances of the repair.

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Information for Specific Honda Models

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 Honda Code

1. What are the common symptoms of OBDII code P0118 in a Honda?

- Common symptoms include the engine running hot or cold, poor fuel economy, rough idling, and a malfunctioning temperature gauge.

2. What can cause the P0118 code to trigger in a Honda?

- The most common causes of this code are a faulty engine coolant temperature sensor, a wiring issue in the coolant temperature sensor circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the P0118 code in my Honda?

- You can diagnose the code by checking the coolant level, inspecting the wiring and connectors of the temperature sensor, testing the sensor's resistance, and scanning the ECM for additional fault codes.

4. Can I drive my Honda with the P0118 code present?

- It is not recommended to drive your Honda with the P0118 code present, as it can lead to engine overheating and potential damage.

5. How do I repair the P0118 code in my Honda?

- To repair the P0118 code, you may need to replace the engine coolant temperature sensor, repair any damaged wiring or connectors, or reprogram the ECM if necessary.

6. Will resetting the check engine light make the P0118 code disappear?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

7. Can a dirty coolant system cause the P0118 code in my Honda?

- Yes, a dirty coolant system or low coolant levels can affect the accuracy of the engine coolant temperature sensor and trigger the P0118 code.

8. How much does it cost to fix the P0118 code in a Honda?

- The cost to fix the P0118 code in a Honda can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

9. Is the P0118 code specific to Hondas only?

- No, the P0118 code indicating Engine Coolant Temperature Sensor 1 Circuit High Voltage can be found in vehicles from various manufacturers, not just Honda.

10. Can a DIY enthusiast fix the P0118 code in a Honda?

- Depending on your level of automotive knowledge and experience, a DIY enthusiast may be able to diagnose and repair the P0118 code in a Honda by following proper diagnostic procedures and using the right tools.

Discuss the causes and fixes for P0118 Honda OBDII Code

Submit a New Comment

  • My mechanic husband says because that code came up we need. an "Engine control ignition relay feedback circuit" (He gets angry when bring it up. I gotta get my smog! He gave it a tune-up. But engine lite stays on...And he dr
    ives like a bat out a hell! HELP! Advice anyone?

    Reply to Comment

  • What model and year is your Honda? do you know the exact code number?

    Reply to Comment