AutoCodes – Ford – P0685 2010 Ford Fusion

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

Quick Answer

This DTC sets when the ignition switch position run circuit indicates the ignition is in the OFF, ACC, or LOCK position, and the amount of time the Powertrain Control Module (PCM) remains powered through the PCM power relay exceeds a predetermined amount of time. Common causes include Faulty Powertrain Control Module (PCM) Power Relay, PCM Power Relay harness is open or shorted, PCM Power Relay circuit poor electrical connection. 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 Powertrain Control Module (PCM) Power Relay, PCM Power Relay harness is open or shorted, PCM Power Relay circuit poor electrical connection.
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.

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Code Popularity 5,487

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0685 2010 Ford Fusion Description

OBDII Code P0685 2010 Ford Fusion - Powertrain Control Module Power Relay Control Circuit Open - AutoCodes.com — P0685 2010 Ford Fusion Code - Powertrain Control Module Power Relay Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0685 2010 Ford Fusion?

Faulty Powertrain Control Module (PCM) Power Relay
PCM Power Relay harness is open or shorted
PCM Power Relay circuit poor electrical connection
Blown PCM fuse
Faulty PCM

How to Fix the DTC P0685 2010 Ford Fusion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0685 2010 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0685 2010 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 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.