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P0686 Ford Code - Engine Control Module Power Relay Control Circuit Low

Quick Answer

The P0686 code for Ford vehicles indicates a problem with the Engine Control Module (ECM) power relay control circuit being detected as low. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay control circuit, Corrosion or loose 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
P0686 Ford indicates Engine Control Module Power Relay Control Circuit Low.
Common causes
Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay control circuit, Corrosion or loose 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 07, 2024
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Code P0686 Ford Description

The P0686 code for Ford vehicles indicates a problem with the Engine Control Module (ECM) power relay control circuit being detected as low. The ECM power relay is responsible for providing power to the ECM, which controls various engine functions and ensures smooth operation. When the power relay control circuit is detected as low, it means that there is a potential issue with the power supply to the ECM, which can result in performance issues and potentially even engine stalling.

OBDII Code P0686 Ford - Engine Control Module Power Relay Control Circuit Low
P0686 Ford Code - Engine Control Module Power Relay Control Circuit Low

Common Causes of P0686 Ford

  1. Faulty ECM power relay
  2. Damaged wiring or connectors in the power relay control circuit
  3. Corrosion or loose connections in the electrical system
  4. Faulty ECM

Symptoms of P0686 Ford

  1. Engine misfires or rough idling
  2. Difficulty starting the engine
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Engine stalling or shutting off unexpectedly

How to Fix P0686 Ford

  1. Diagnose the specific cause of the issue using a diagnostic scanner to pinpoint the faulty component.
  2. Inspect the power relay control circuit for any damaged wiring or connectors and repair or replace as necessary.
  3. Test the power relay for functionality and replace if found to be faulty.
  4. If the issue persists, inspect the ECM for any signs of damage or malfunction and replace if necessary.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0686 Ford

The typical repair costs for addressing a P0686 code on a Ford vehicle can range from $150 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is essential to factor in the cost of diagnostic time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. It is advisable to consult with local repair shops to get a more accurate estimate based on the specific circumstances.

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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 P0686 Ford Code

1. What are common symptoms of OBDII code P0686 in a Ford vehicle?

- Common symptoms include difficulty starting the engine, engine stalling, and the Check Engine light being illuminated on the dashboard.

2. What can cause the OBDII code P0686 to trigger in a Ford vehicle?

- The code P0686 is typically triggered by a malfunction in the engine control module power relay control circuit, often caused by a faulty relay or damaged wiring.

3. How can I diagnose the cause of OBDII code P0686 in my Ford vehicle?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble codes, inspect the engine control module power relay and related wiring for any visible damage, and perform circuit testing using a multimeter.

4. Can I drive my Ford vehicle with the OBDII code P0686 present?

- It is not recommended to drive the vehicle with the code P0686 present, as it can lead to potential engine performance issues and may cause further damage if left unaddressed.

5. How can I repair the Engine Control Module Power Relay Control Circuit Low issue in my Ford vehicle?

- Repairing the P0686 code involves inspecting and, if necessary, replacing the engine control module power relay, repairing any damaged wiring, and clearing the trouble codes using a diagnostic scanner.

6. Is it possible to reset the OBDII code P0686 in a Ford vehicle without fixing the underlying issue?

- While you can clear the trouble code using a diagnostic scanner, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. Can a DIY enthusiast fix the OBDII code P0686 in a Ford vehicle?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address the P0686 code by replacing the engine control module power relay and checking the related wiring for any damage.

8. Are there any preventive maintenance steps to avoid OBDII code P0686 in a Ford vehicle?

- Regularly inspecting the engine control module power relay and related wiring for signs of wear or damage can help prevent the occurrence of the P0686 trouble code.

9. How long does it take to repair the OBDII code P0686 in a Ford vehicle?

- The repair time for the P0686 code can vary depending on the extent of the issue and your experience level. It may take anywhere from 30 minutes to a few hours to complete the repair.

10. Will fixing the OBDII code P0686 improve my Ford vehicle's performance?

- Addressing the P0686 code and restoring proper function to the engine control module power relay control circuit can help improve engine performance and overall vehicle operation.

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