Engine-Codes.com
Engine-Codes – Ford – P0685 2010 Ford Fusion

P0685 2010 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Quick Answer

The P0685 diagnostic trouble code (DTC) for a 2010 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 damage. 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 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 damage.
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
💬 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 P0685 2010 Ford Fusion Description

The P0685 diagnostic trouble code (DTC) for a 2010 Ford Fusion indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. The PCM is a critical 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 2010 Ford Fusion - Powertrain Control Module Power Relay Control Circuit Open
P0685 2010 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

Common Causes of P0685 2010 Ford Fusion

  1. Faulty power relay
  2. Loose or corroded electrical connections
  3. Wiring harness damage
  4. PCM failure
  5. Battery or alternator issues

Symptoms of P0685 2010 Ford Fusion

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

How to Fix P0685 2010 Ford Fusion

  1. Begin by inspecting the power relay and its connections for any signs of damage or corrosion. Replace the relay if necessary.
  2. Check the wiring harness for any breaks, frays, or loose connections. Repair or replace damaged wiring as needed.
  3. Test the PCM to determine if it is receiving power. If not, check for any underlying issues with the battery or alternator.
  4. Clear the DTC and reset the PCM to see if the code reappears. If it does, further diagnostics may be required to pinpoint the exact cause of the issue.
  5. Once the root cause is identified, repair or replace the faulty components to resolve the P0685 code and restore proper power supply to the PCM.

Cost to Fix P0685 2010 Ford Fusion

The typical repair costs for addressing a P0685 code on a 2010 Ford Fusion can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty power relay or repairing damaged wiring may cost between $100 and $300, including parts and labor. However, if the PCM itself needs to be replaced, the cost can range from $500 to $1000 or more. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to obtain a detailed estimate from a qualified technician before proceeding with the repairs.

What does this mean?

Tech Notes for P0685 2010 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 2010 Ford Fusion code?

Need more information on how to fix the P0685 2010 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0685 2010 Ford Fusion 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 P0685 2010 Ford Fusion Code

1. What does OBDII code P0685 for a 2010 Ford Fusion mean?

- The code P0685 indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open, affecting the ability to control the power relay.

2. What are the common symptoms of OBDII code P0685 in a 2010 Ford Fusion?

- Common symptoms include engine stalling, rough idling, difficulty starting the engine, and the vehicle going into "limp mode" with reduced performance.

3. What are the possible causes of OBDII code P0685 in a 2010 Ford Fusion?

- The main causes can be 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 issue related to OBDII code P0685 in my 2010 Ford Fusion?

- Diagnosing the problem involves checking the power relay, inspecting the wiring and connectors for any damage, testing the voltage at the relay, and scanning the PCM for any related trouble codes.

5. Can I continue driving my 2010 Ford Fusion with OBDII code P0685?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues. It's best to address the problem promptly.

6. How can I repair OBDII code P0685 in a 2010 Ford Fusion?

- Repair options include replacing the faulty power relay, repairing any damaged wiring or connectors, resetting the PCM after fixing the issue, and ensuring all connections are secure.

7. Can I reset the OBDII code P0685 in my 2010 Ford Fusion by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it's crucial to diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

8. Is it necessary to take my 2010 Ford Fusion to a mechanic for OBDII code P0685 repair?

- While some DIY enthusiasts may be able to address the issue themselves, consulting a qualified mechanic is recommended for proper diagnosis and repair of the power relay control circuit.

9. How much does it typically cost to repair OBDII code P0685 in a 2010 Ford Fusion?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts such as a new power relay, labor costs, and diagnostic fees.

10. Will fixing OBDII code P0685 improve the overall performance of my 2010 Ford Fusion?

- Yes, addressing this code and repairing the power relay control circuit can help restore the proper functioning of the PCM, leading to improved engine performance and overall vehicle operation.

Discuss the causes and fixes for P0685 2010 Ford Fusion OBDII Code

Submit a New Comment

Code P0685 2010 Ford Fusion comments

No comments found for this page.