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P0685 2012 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Quick Answer

The diagnostic trouble code P0685 for a 2012 Ford Fusion indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. Common causes include Faulty power relay, Loose or corroded electrical connections, Wiring harness issues. 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 2012 Ford Fusion indicates Powertrain Control Module Power Relay Control Circuit Open.
Common causes
Common causes include Faulty power relay, Loose or corroded electrical connections, Wiring harness issues.
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 27, 2024
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Code P0685 2012 Ford Fusion Description

The diagnostic trouble code P0685 for a 2012 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.

OBDII Code P0685 2012 Ford Fusion - Powertrain Control Module Power Relay Control Circuit Open
P0685 2012 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Common Causes of P0685 2012 Ford Fusion

  1. Faulty power relay
  2. Loose or corroded electrical connections
  3. Wiring harness issues
  4. PCM failure
  5. Electrical system malfunctions

Symptoms of P0685 2012 Ford Fusion

  1. Engine misfires or rough idling
  2. Stalling or difficulty starting the engine
  3. Reduced engine power or acceleration
  4. Illumination of the Check Engine Light
  5. Poor fuel efficiency

How to Fix P0685 2012 Ford Fusion

  1. Begin by conducting a visual inspection of the power relay, wiring, and electrical connections to check for any obvious signs of damage or corrosion.
  2. Use a multimeter to test the power relay and ensure it is functioning correctly. Replace the relay if necessary.
  3. Inspect the wiring harness for any breaks, frays, or loose connections. Repair or replace damaged wiring as needed.
  4. Test the PCM to determine if it is receiving power from the relay. If the PCM is not receiving power, further diagnostics may be required to identify the root cause of the issue.
  5. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0685 2012 Ford Fusion

The cost of repairing a P0685 code on a 2012 Ford Fusion can vary depending on the specific cause of the issue. In general, the cost of replacing a power relay or repairing wiring harnesses can range from $100 to $300, including parts and labor. However, if the PCM needs to be replaced, the cost can be significantly higher, potentially exceeding $500. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

What does this mean?

Tech Notes for P0685 2012 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 2012 Ford Fusion Code

1. What does the OBDII code P0685 on a 2012 Ford Fusion indicate?

The code P0685 in a 2012 Ford Fusion signifies a Powertrain Control Module (PCM) Power Relay Control Circuit Open.

2. What are the common symptoms of the P0685 code in a 2012 Ford Fusion?

Common symptoms of the P0685 code may include engine stalling, rough idling, difficulty starting the vehicle, and in some cases, the engine may not start at all.

3. What are the possible causes of the P0685 code in a 2012 Ford Fusion?

Potential causes of the P0685 code include a faulty power relay, damaged wiring or connectors in the power relay circuit, a defective PCM, or a blown fuse related to the power relay.

4. How can I diagnose the P0685 code on my 2012 Ford Fusion?

Diagnosing the P0685 code involves inspecting the power relay, checking the wiring and connectors in the power relay circuit for damage, testing the voltage at the relay, and scanning the PCM for any related trouble codes.

5. Can I still drive my 2012 Ford Fusion with the P0685 code present?

It is not recommended to drive your vehicle with the P0685 code active, as it can lead to further damage to the engine or electrical system. It's best to address the issue promptly.

6. How can I repair the P0685 code on my 2012 Ford Fusion?

To repair the P0685 code, you may need to replace the faulty power relay, repair any damaged wiring or connectors, replace a defective PCM if necessary, and ensure all related fuses are in proper working condition.

7. Is it possible to reset the P0685 code in a 2012 Ford Fusion without making any repairs?

While clearing the code may temporarily turn off the check engine light, it is crucial to address the underlying issue causing the P0685 code to prevent further problems with your vehicle.

8. Will the P0685 code in a 2012 Ford Fusion cause poor fuel efficiency?

The P0685 code itself may not directly impact fuel efficiency, but if left unresolved, it can lead to engine performance issues that might affect the fuel economy of your Ford Fusion.

9. Can a DIY enthusiast fix the P0685 code on a 2012 Ford Fusion?

Depending on your mechanical skills and access to tools, a DIY enthusiast may be able to address the P0685 code by following proper diagnostic procedures and making necessary repairs like replacing the power relay.

10. How much can I expect to pay to fix the P0685 code on a 2012 Ford Fusion at a repair shop?

The cost of fixing the P0685 code can vary based on the root cause of the issue and local labor rates. It's advisable to consult a trusted mechanic for an accurate estimate of repair costs.

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