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P0118 2018 Honda CR-V Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Quick Answer

The P0118 code on a 2018 Honda CR-V indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit registering a high voltage. Common causes include Faulty ECT Sensor: The ECT sensor itself may be malfunctioning, providing incorrect voltage readings to the ECM, Wiring or Connector Issues: Corrosion, damage, or poor connections in the ECT circuit can disrupt the signal between the sensor and the ECM, Faulty ECM: A problem with the engine control module can prevent it from interpreting the ECT sensor data accurately. 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 2018 Honda CR-V indicates Engine Coolant Temperature Sensor 1 Circuit High Voltage.
Common causes
Common causes include Faulty ECT Sensor: The ECT sensor itself may be malfunctioning, providing incorrect voltage readings to the ECM, Wiring or Connector Issues: Corrosion, damage, or poor connections in the ECT circuit can disrupt the signal between the sensor and the ECM, Faulty ECM: A problem with the engine control module can prevent it from interpreting the ECT sensor data accurately.
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 2018 Honda CR-V Description

The P0118 code on a 2018 Honda CR-V indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit registering a high voltage. 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. When the sensor reports a high voltage, it suggests that the engine coolant temperature is higher than expected, potentially leading to issues with engine performance, emissions, and overall vehicle operation.

OBDII Code P0118 2018 Honda CR-V - Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 2018 Honda CR-V Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Common Causes of P0118 2018 Honda CR-V

  1. Faulty ECT Sensor: The ECT sensor itself may be malfunctioning, providing incorrect voltage readings to the ECM.
  2. Wiring or Connector Issues: Corrosion, damage, or poor connections in the ECT circuit can disrupt the signal between the sensor and the ECM.
  3. Faulty ECM: A problem with the engine control module can prevent it from interpreting the ECT sensor data accurately.
  4. Engine Coolant Issues: Low coolant levels, air pockets in the cooling system, or a malfunctioning thermostat can affect the engine coolant temperature readings.
  5. Electrical Problems: Issues with the vehicle's electrical system, such as a short circuit or a blown fuse, can also trigger the P0118 code.

Symptoms of P0118 2018 Honda CR-V

  1. Check Engine Light: The most common symptom associated with the P0118 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Engine Overheating: A faulty ECT sensor may provide inaccurate temperature readings, leading to engine overheating if the cooling system is not properly regulated.
  3. Poor Fuel Economy: Incorrect engine coolant temperature data can result in inefficient fuel delivery, causing decreased fuel economy.
  4. Rough Idling: The ECM may struggle to adjust engine parameters correctly based on faulty temperature readings, leading to rough idling or stalling.
  5. Reduced Engine Performance: The vehicle may experience a loss of power, hesitation, or sluggish acceleration due to improper fuel and ignition timing adjustments.

How to Fix P0118 2018 Honda CR-V

  1. Diagnose the Issue: Use a scan tool to retrieve the P0118 code and perform a thorough inspection of the ECT sensor, wiring, connectors, and ECM to identify the root cause of the high voltage signal.
  2. Replace the ECT Sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
  3. Check Wiring and Connectors: Inspect the wiring harness and connectors for any signs of damage, corrosion, or poor connections. Repair or replace as needed.
  4. Test ECM Functionality: Verify that the ECM is functioning correctly and receiving accurate data from the new ECT sensor. Reset the fault codes and test drive the vehicle to confirm that the issue has been resolved.
  5. Verify Coolant System Operation: Check the coolant level, inspect the cooling system for leaks or air pockets, and ensure that the thermostat is functioning properly to prevent future ECT sensor issues.

Cost to Fix P0118 2018 Honda CR-V

The typical repair costs for addressing a P0118 code on a 2018 Honda CR-V can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the ECT sensor and addressing any wiring or connector issues may cost between $100 and $300 for parts and labor. Additional costs may apply if the ECM needs to be replaced or if other components in the cooling system require attention.

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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 2018 Honda CR-V Code

1. What are the common symptoms of OBDII code P0118 in a 2018 Honda CR-V?

The common symptoms of code P0118 in a 2018 Honda CR-V include engine overheating, poor fuel economy, and the check engine light illuminating on the dashboard.

2. What does the OBDII code P0118 indicate in a 2018 Honda CR-V?

Code P0118 in a 2018 Honda CR-V refers to a high voltage condition in the Engine Coolant Temperature (ECT) Sensor 1 circuit, signaling a potential issue with the engine's coolant temperature.

3. What are the possible causes of OBDII code P0118 in a 2018 Honda CR-V?

Potential causes of code P0118 in a 2018 Honda CR-V include a faulty ECT sensor, damaged wiring or connectors in the ECT circuit, low coolant level, or issues with the engine's cooling system.

4. How can I diagnose the cause of OBDII code P0118 in my 2018 Honda CR-V?

To diagnose the cause of code P0118, you can start by checking the ECT sensor's wiring and connectors for any damage or corrosion. Additionally, ensure the coolant level is adequate and inspect the cooling system for any leaks or malfunctions.

5. Can I continue driving my 2018 Honda CR-V with OBDII code P0118?

While it may be possible to drive your vehicle with code P0118, it is not recommended as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further complications.

6. How do I repair OBDII code P0118 in a 2018 Honda CR-V?

Repairing code P0118 in a 2018 Honda CR-V typically involves replacing the Engine Coolant Temperature sensor if faulty, repairing any damaged wiring or connectors, and ensuring the cooling system is functioning correctly.

7. Will resetting the check engine light resolve OBDII code P0118 in my 2018 Honda CR-V?

Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing code P0118. It is essential to diagnose and repair the root cause of the problem to prevent it from recurring.

8. How much does it cost to fix OBDII code P0118 in a 2018 Honda CR-V?

The cost of fixing code P0118 in a 2018 Honda CR-V can vary depending on the cause of the issue. Replacing the ECT sensor can cost between $50 to $200, while repairs to wiring or the cooling system may incur additional expenses.

9. Can a DIY enthusiast repair OBDII code P0118 in a 2018 Honda CR-V?

DIY enthusiasts with automotive experience and the necessary tools can attempt to repair code P0118 in a 2018 Honda CR-V by following repair guides and tutorials. However, if unsure, it is advisable to seek professional help.

10. How often does OBDII code P0118 occur in a 2018 Honda CR-V?

Code P0118 related to the Engine Coolant Temperature Sensor circuit high voltage issue can occur sporadically in a 2018 Honda CR-V, especially if the sensor or related components are nearing the end of their lifespan. Regular maintenance can help prevent such codes from appearing frequently.

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