Engine-Codes.com
Engine-Codes – Honda – P0118 2008 Honda Accord

P0118 2008 Honda Accord Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Quick Answer

The P0118 code on a 2008 Honda Accord indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically detecting high voltage. Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Wiring or connector issues in the ECT circuit, Malfunctioning Engine Control Module (ECM). 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 2008 Honda Accord indicates Engine Coolant Temperature Sensor 1 Circuit High Voltage.
Common causes
Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Wiring or connector issues in the ECT circuit, Malfunctioning Engine Control Module (ECM).
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 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0118 2008 Honda Accord Description

The P0118 code on a 2008 Honda Accord indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically detecting high voltage. The ECT sensor is a crucial component that monitors the temperature of the engine coolant and sends this information to the engine control module (ECM). The ECM uses this data to adjust fuel injection, ignition timing, and other engine functions to ensure optimal performance and efficiency.

OBDII Code P0118 2008 Honda Accord - Engine Coolant Temperature Sensor 1 Circuit High Voltage
P0118 2008 Honda Accord Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Common Causes of P0118 2008 Honda Accord

  1. Faulty Engine Coolant Temperature (ECT) sensor
  2. Wiring or connector issues in the ECT circuit
  3. Malfunctioning Engine Control Module (ECM)
  4. Engine coolant level or quality issues
  5. Cooling system problems such as a stuck thermostat

Symptoms of P0118 2008 Honda Accord

  1. Poor fuel economy
  2. Rough idling
  3. Engine overheating
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P0118 2008 Honda Accord

  1. Begin by diagnosing the issue using a scan tool to verify the P0118 code and check the ECT sensor's readings.
  2. Inspect the ECT sensor, wiring, and connector for any visible damage or corrosion. Replace any damaged components.
  3. Test the ECT sensor's resistance and voltage to ensure it is functioning correctly.
  4. If the ECT sensor tests faulty, replace it with a new sensor following the manufacturer's guidelines.
  5. Clear the diagnostic trouble codes, reset the ECM, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0118 2008 Honda Accord

The typical repair costs for addressing a P0118 code on a 2008 Honda Accord can range from $100 to $300, including parts and labor. However, actual costs may vary depending on the specific diagnosis time and labor rates at auto repair shops, which can range from $80 to $150 per hour. It is advisable to check with local repair shops for a more accurate estimate based on your location and vehicle specifics.

When is the Code Detected?

An excessively high voltage from the sensor is sent to ECM.

Need more information about the P0118 2008 Honda Accord code?

Need more information on how to fix the P0118 2008 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0118 2008 Honda Accord code diagnosed by a professional: Find a repair shop in your area

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 2008 Honda Accord Code

1. What are the common symptoms of OBDII code P0118 in a 2008 Honda Accord?

The common symptoms of code P0118 in a 2008 Honda Accord include the dashboard temperature gauge reading unusually high or erratic temperatures, engine overheating, and a potential decrease in fuel efficiency.

2. What causes the OBDII code P0118 to appear in a 2008 Honda Accord?

The most common cause of code P0118 in a 2008 Honda Accord is a malfunctioning Engine Coolant Temperature (ECT) sensor, which may be sending a high voltage signal to the vehicle's engine control module (ECM).

3. How serious is the OBDII code P0118 in a 2008 Honda Accord?

While code P0118 may not always cause immediate drivability issues, it can lead to engine performance problems, potential overheating, and even long-term damage if left unresolved. It is recommended to address this issue promptly.

4. Can a faulty thermostat cause code P0118 in a 2008 Honda Accord?

Yes, a faulty thermostat can sometimes cause code P0118 to appear in a 2008 Honda Accord. If the thermostat is stuck closed or not functioning properly, it can affect the engine coolant temperature readings and trigger the high voltage circuit fault.

5. How can I diagnose and repair OBDII code P0118 in my 2008 Honda Accord?

To diagnose and repair code P0118, start by checking the ECT sensor for any signs of damage or corrosion. Test the sensor's resistance and voltage output to determine if it is functioning correctly. If needed, replace the ECT sensor and clear the code to see if the issue is resolved.

6. Is it safe to continue driving with OBDII code P0118 present in a 2008 Honda Accord?

It is generally not recommended to continue driving with code P0118 present in a 2008 Honda Accord, as it can lead to potential engine overheating and damage. It is best to address the issue promptly to avoid further complications.

7. Can a dirty or low coolant level trigger OBDII code P0118 in a 2008 Honda Accord?

Yes, a dirty or low coolant level can sometimes trigger code P0118 in a 2008 Honda Accord. Insufficient coolant or contaminants in the coolant can affect the ECT sensor readings and cause the high voltage circuit fault.

8. Will disconnecting the battery reset OBDII code P0118 in a 2008 Honda Accord?

Disconnecting the battery may clear the code temporarily, but if the underlying issue with the ECT sensor or cooling system is not addressed, the code is likely to reappear after some driving cycles. It is best to diagnose and fix the root cause of the problem.

9. Can a damaged wiring harness cause OBDII code P0118 in a 2008 Honda Accord?

Yes, a damaged or corroded wiring harness connected to the ECT sensor can cause code P0118 in a 2008 Honda Accord. Inspect the wiring for any visible damage and repair or replace as needed to resolve the high voltage circuit fault.

10. How much does it typically cost to repair OBDII code P0118 in a 2008 Honda Accord?

The cost of repairing code P0118 in a 2008 Honda Accord can vary depending on the underlying issue, such as replacing the ECT sensor, fixing wiring problems, or addressing cooling system issues. Costs can range from around $50 for a DIY ECT sensor replacement to a few hundred dollars at a repair shop for more extensive repairs.

Discuss the causes and fixes for P0118 2008 Honda Accord OBDII Code

Submit a New Comment