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P0685 2010 Honda Accord Code - Engine Control Module Power Relay Control Circuit Open

Quick Answer

The P0685 diagnostic trouble code for a 2010 Honda Accord indicates a problem with the Engine Control Module (ECM) power relay control circuit being open. Common causes include Faulty ECM power relay, Damaged or corroded wiring in the power relay circuit, Loose or poor electrical connections. 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
P0685 2010 Honda Accord indicates Engine Control Module Power Relay Control Circuit Open.
Common causes
Common causes include Faulty ECM power relay, Damaged or corroded wiring in the power relay circuit, Loose or poor electrical connections.
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 11, 2024
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Code P0685 2010 Honda Accord Description

The P0685 diagnostic trouble code for a 2010 Honda Accord indicates a problem with the Engine Control Module (ECM) power relay control circuit being open. The ECM power relay is responsible for supplying power to the ECM, which is essential for proper engine operation. When the control circuit is open, it means that there is a break or interruption in the electrical connection between the relay and the ECM. This can lead to a variety of issues that can affect the vehicle's performance and drivability.

OBDII Code P0685 2010 Honda Accord - Engine Control Module Power Relay Control Circuit Open
P0685 2010 Honda Accord Code - Engine Control Module Power Relay Control Circuit Open

Common Causes of P0685 2010 Honda Accord

  1. Faulty ECM power relay
  2. Damaged or corroded wiring in the power relay circuit
  3. Loose or poor electrical connections
  4. ECM power relay control circuit fuse is blown
  5. ECM power relay control circuit module malfunction

Symptoms of P0685 2010 Honda Accord

  1. Check Engine Light illuminated on the dashboard
  2. Engine may stall or have difficulty starting
  3. Reduced fuel efficiency
  4. Rough idling or engine misfires
  5. Loss of power or acceleration

How to Fix P0685 2010 Honda Accord

  1. Begin by diagnosing the root cause of the issue using a diagnostic scanner to retrieve the trouble codes and identify the specific problem.
  2. Inspect the ECM power relay and associated wiring for any signs of damage, corrosion, or loose connections. Replace or repair any faulty components as needed.
  3. Check and replace any blown fuses related to the ECM power relay control circuit.
  4. Test the ECM power relay and control circuit to ensure proper functionality.
  5. Clear the trouble codes from the vehicle's ECM memory and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0685 2010 Honda Accord

The cost of repairing a P0685 code on a 2010 Honda Accord can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $200. Overall, the total repair cost may fall between $150 and $400. It is important to consider that labor rates can vary based on location and the shop's expertise, so it is recommended to obtain quotes from multiple sources to get an accurate estimate.

What does this mean?

Tech Notes for P0685 2010 Honda Accord

Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the ECM relay should take care of the problem.

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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 P0685 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P0685 in a 2010 Honda Accord?

- Common symptoms include engine stalling, rough idling, and difficulty starting the vehicle.

2. What does the OBDII code P0685 in a 2010 Honda Accord indicate?

- This code indicates a problem with the Engine Control Module Power Relay Control Circuit being open, which can disrupt the power supply to the ECM.

3. What are the possible causes of the Engine Control Module Power Relay Control Circuit Open in a 2010 Honda Accord?

- Possible causes include a faulty power relay, damaged wiring or connectors in the circuit, or a malfunctioning Engine Control Module.

4. How can I diagnose the issue causing OBDII code P0685 in my 2010 Honda Accord?

- Diagnosing the issue involves checking the power relay, inspecting the wiring and connectors for damage, and testing the Engine Control Module for proper functioning.

5. Can I continue driving my 2010 Honda Accord with the P0685 code?

- It is not recommended to continue driving with this code as it can lead to further electrical issues and potential engine problems.

6. What are the repair options for fixing OBDII code P0685 in a 2010 Honda Accord?

- Repair options include replacing the power relay, repairing any damaged wiring or connectors, or replacing the Engine Control Module if necessary.

7. How much does it cost to fix OBDII code P0685 in a 2010 Honda Accord?

- The cost of repairs can vary depending on the extent of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

8. Can I reset the OBDII code P0685 in my 2010 Honda Accord using a diagnostic tool?

- Yes, you can reset the code using a diagnostic tool, but it is important to address the underlying issue causing the code to prevent it from coming back.

9. Are there any preventive measures to avoid OBDII code P0685 in a 2010 Honda Accord?

- Regularly inspecting the electrical components, such as relays and wiring, can help prevent issues that may trigger this code.

10. Will OBDII code P0685 cause my 2010 Honda Accord to fail an emissions test?

- Yes, the presence of this code may cause your vehicle to fail an emissions test, as it indicates a problem with the engine control system.

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