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P0685 2008 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Quick Answer

The P0685 diagnostic trouble code (DTC) for a 2008 Ford Fusion indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. Common causes include Faulty power relay, Damaged wiring or connectors in the control circuit, Corrosion or poor connections in the electrical system. 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 2008 Ford Fusion indicates Powertrain Control Module Power Relay Control Circuit Open.
Common causes
Common causes include Faulty power relay, Damaged wiring or connectors in the control circuit, Corrosion or poor connections in the electrical system.
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 P0685 2008 Ford Fusion Description

The P0685 diagnostic trouble code (DTC) for a 2008 Ford Fusion indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. The PCM is a crucial component of the vehicle's engine management system, responsible for controlling various functions such as fuel injection, ignition timing, and emissions. The power relay control circuit is essential for providing power to the PCM, allowing it to function properly. When this circuit is open, it means that there is a break or interruption in the electrical connection, preventing the PCM from receiving the necessary power supply.

OBDII Code P0685 2008 Ford Fusion - Powertrain Control Module Power Relay Control Circuit Open
P0685 2008 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Common Causes of P0685 2008 Ford Fusion

  1. Faulty power relay
  2. Damaged wiring or connectors in the control circuit
  3. Corrosion or poor connections in the electrical system
  4. Malfunctioning PCM
  5. Electrical short circuits

Symptoms of P0685 2008 Ford Fusion

  1. Engine stalling or rough idling
  2. Difficulty starting the engine
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Loss of power while driving

How to Fix P0685 2008 Ford Fusion

  1. Begin by conducting a thorough inspection of the power relay, wiring, and connectors in the control circuit to identify any visible damage or corrosion.
  2. Test the power relay using a multimeter to determine if it is functioning correctly. Replace the relay if necessary.
  3. Check for continuity in the wiring and connectors to ensure there are no breaks or shorts. Repair or replace any damaged components.
  4. Clear the DTC from the PCM memory using a diagnostic scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, consider seeking professional help from a certified mechanic or dealership to diagnose and repair any underlying issues with the PCM or other related components.

Cost to Fix P0685 2008 Ford Fusion

The typical repair costs for addressing a P0685 DTC on a 2008 Ford Fusion can vary depending on the specific cause of the issue. In general, replacing a faulty power relay or repairing damaged wiring may cost between $100 and $300, including parts and labor. However, if the problem is more complex and requires extensive diagnostics or replacement of the PCM, the repair costs could increase significantly. It is advisable to consult with a trusted mechanic or repair shop to obtain a more accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates can vary widely, so it's essential to research local rates and compare quotes before proceeding with the repair.

What does this mean?

Tech Notes for P0685 2008 Ford Fusion

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 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P0685 in a 2008 Ford Fusion?

- Common symptoms include the engine not starting, stalling, or running rough. The vehicle may also experience issues with the electrical system.

2. What does the OBDII code P0685 in a 2008 Ford Fusion indicate?

- This code indicates a problem with the Powertrain Control Module (PCM) power relay control circuit being open.

3. What are the possible causes of the OBDII code P0685 in a 2008 Ford Fusion?

- Potential causes include a faulty PCM power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning PCM.

4. How can I diagnose the OBDII code P0685 in my 2008 Ford Fusion?

- Diagnosing this code typically involves checking the power relay, inspecting the wiring and connectors in the circuit, and testing the PCM for any faults.

5. Can I still drive my 2008 Ford Fusion with the OBDII code P0685?

- It is not recommended to drive the vehicle with this code as it can lead to further damage or safety issues. It is best to address the underlying problem promptly.

6. How can I repair the OBDII code P0685 in my 2008 Ford Fusion?

- Repair options may include replacing the PCM power relay, repairing any damaged wiring or connectors, or replacing the PCM if necessary.

7. Is it safe to reset the OBDII code P0685 in my 2008 Ford Fusion using a diagnostic tool?

- While resetting the code may temporarily turn off the check engine light, it will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent future issues.

8. Can a DIY enthusiast fix the OBDII code P0685 in a 2008 Ford Fusion?

- Depending on your level of automotive expertise, it may be possible to address this code yourself by following repair guides and using the necessary tools. However, professional help is recommended for accurate diagnosis and repair.

9. How much can I expect to pay for repairing the OBDII code P0685 in a 2008 Ford Fusion?

- Repair costs can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take the vehicle to a mechanic. Costs may include parts and labor.

10. Are there any preventive measures to avoid the OBDII code P0685 in a 2008 Ford Fusion?

- Regular maintenance, such as checking the electrical system components and keeping an eye on any warning signs, can help prevent issues leading to this code.

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