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Engine-Codes – Ford – P0685 2006 Ford Fusion

P0685 2006 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Quick Answer

The P0685 diagnostic trouble code (DTC) for a 2006 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 power relay control circuit, Malfunctioning PCM. 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 2006 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 power relay control circuit, Malfunctioning PCM.
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 2006 Ford Fusion Description

The P0685 diagnostic trouble code (DTC) for a 2006 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 electronic control system, responsible for managing various functions such as fuel injection, ignition timing, and emissions control. 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 2006 Ford Fusion - Powertrain Control Module Power Relay Control Circuit Open
P0685 2006 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Common Causes of P0685 2006 Ford Fusion

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

Symptoms of P0685 2006 Ford Fusion

  1. Engine misfires or runs rough
  2. Difficulty starting the engine
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Vehicle may go into "limp mode" to protect the engine

How to Fix P0685 2006 Ford Fusion

  1. Begin by conducting a thorough inspection of the power relay control circuit, checking for any visible damage or loose connections.
  2. Test the power relay using a multimeter to determine if it is functioning correctly. Replace the relay if necessary.
  3. Inspect the wiring and connectors in the power relay control circuit for any signs of damage or corrosion. Repair or replace as needed.
  4. Check the PCM for any signs of malfunction, such as error codes or unusual behavior. Replace the PCM if it is determined to be faulty.
  5. Clear the DTC using a scan tool after completing the repairs and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0685 2006 Ford Fusion

The typical repair costs for addressing a P0685 code on a 2006 Ford Fusion can vary depending on the specific cause of the issue. In general, the cost of replacing a power relay can range from $50 to $150, while repairing damaged wiring or connectors may cost between $100 and $300. If the PCM needs to be replaced, the cost can be significantly higher, ranging from $500 to $1000 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total cost of repairs can add up quickly. It is advisable to consult with a qualified mechanic to get an accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for P0685 2006 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.

Need more information about the P0685 2006 Ford Fusion code?

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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 2006 Ford Fusion Code

1. What are the common symptoms of OBDII code P0685 in a 2006 Ford Fusion?

The common symptoms of P0685 include engine stalling, difficulty starting the vehicle, and the illumination of the Check Engine Light.

2. What does the OBDII code P0685 on a 2006 Ford Fusion mean?

P0685 indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open, which can disrupt the power supply to the PCM.

3. What are the possible causes of the P0685 code in a 2006 Ford Fusion?

Possible causes of P0685 include a faulty PCM power relay, damaged wiring or connectors in the relay circuit, or a defective PCM.

4. How can I diagnose the P0685 code in my 2006 Ford Fusion?

Diagnosing the P0685 code involves checking the PCM power relay, inspecting the relay circuit for any damage, and testing the PCM itself for any faults using a multimeter.

5. Can I still drive my 2006 Ford Fusion with the P0685 code present?

It is not recommended to drive your vehicle with the P0685 code present, as it can lead to potential engine performance issues and further damage if left unresolved.

6. How can I repair the P0685 code on my 2006 Ford Fusion?

To repair the P0685 code, you may need to replace the faulty PCM power relay, repair any damaged wiring or connectors in the circuit, or replace the PCM if necessary.

7. Will resetting the trouble codes make the P0685 code disappear?

Resetting the trouble codes may temporarily clear the Check Engine Light, but if the underlying issue causing the P0685 code is not addressed, the code is likely to reappear.

8. Is it possible to prevent the P0685 code from appearing in my 2006 Ford Fusion?

Regular maintenance and inspection of the PCM power relay and associated wiring can help prevent the occurrence of the P0685 code in your vehicle.

9. Can a DIY enthusiast fix the P0685 code in a 2006 Ford Fusion?

While some DIY enthusiasts may be able to diagnose and repair the P0685 code themselves, it is recommended to seek professional help for a thorough diagnosis and proper repair.

10. How much can I expect to pay to fix the P0685 code in a 2006 Ford Fusion?

The cost to fix the P0685 code can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your vehicle to a mechanic. Costs can range from a few hundred to over a thousand dollars.

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