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

Quick Answer

The P0686 diagnostic trouble code for Lincoln vehicles indicates an issue with the engine control module power relay control circuit being detected as low. Common causes include Faulty power relay, Wiring or connection issues in the control circuit, Malfunctioning ECM. 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 Lincoln indicates Engine Control Module Power Relay Control Circuit Low.
Common causes
Common causes include Faulty power relay, Wiring or connection issues in the control circuit, Malfunctioning ECM.
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 12, 2024
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Code P0686 Lincoln Description

The P0686 diagnostic trouble code for Lincoln vehicles indicates an issue with the engine control module power relay control circuit being detected as low. The engine control module (ECM) is responsible for managing various engine functions, such as fuel injection, ignition timing, and emissions control. The power relay control circuit is a crucial component that provides power to the ECM, allowing it to function properly.

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

Common Causes of P0686 Lincoln

  1. Faulty power relay
  2. Wiring or connection issues in the control circuit
  3. Malfunctioning ECM
  4. Weak or drained battery
  5. Electrical system issues

Symptoms of P0686 Lincoln

  1. Engine misfires or hesitation
  2. Check Engine Light illuminated on the dashboard
  3. Loss of power or acceleration
  4. Rough idling or stalling
  5. Difficulty starting the vehicle

How to Fix P0686 Lincoln

  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 and connections in the control circuit for any loose connections or frayed wires. Repair or replace as needed.
  3. Test the ECM for any malfunctions using a diagnostic scanner. Replace the ECM if it is found to be faulty.
  4. Inspect the battery to ensure it is delivering the correct voltage to the ECM. Replace the battery if it is weak or drained.
  5. Clear the diagnostic trouble codes from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0686 Lincoln

The typical repair costs for addressing a P0686 code in a Lincoln vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty power relay can cost between $50 and $150, while repairing wiring or connection issues may range from $100 to $300. If the ECM needs to be replaced, the cost can be significantly higher, typically ranging from $500 to $1000. Labor costs for these repairs can add an additional $80 to $150 per hour, depending on the shop's rates and location. It's advisable to consult with a trusted mechanic or dealership to get a more accurate estimate based on your vehicle's make and model.

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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 Lincoln Code

1. What are the common symptoms of OBDII code P0686 in a Lincoln?

Symptoms may include difficulty starting the vehicle, engine stalling, or the check engine light illuminating on the dashboard.

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

This code is typically triggered by issues with the engine control module power relay control circuit experiencing low voltage.

3. How do I diagnose the cause of the OBDII code P0686 in my Lincoln?

Diagnosis involves checking the power relay control circuit for any loose connections, damaged wiring, or a faulty relay, using a multimeter or similar tool.

4. Can a bad engine control module cause the P0686 code in a Lincoln?

Yes, a malfunctioning engine control module can potentially cause issues with the power relay control circuit, leading to the P0686 code.

5. What are some repair tips for fixing the OBDII code P0686 in a Lincoln?

Repair tips may include checking and repairing any damaged wiring or connectors, replacing a faulty relay, or even replacing the engine control module if necessary.

6. Is it safe to continue driving my Lincoln with the P0686 code present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further issues and potential drivability problems.

7. How much does it typically cost to repair the OBDII code P0686 in a Lincoln?

Repair costs can vary depending on the exact cause of the issue, but it may range from a simple relay replacement to a more involved repair involving the engine control module.

8. Can resetting the OBDII code P0686 in my Lincoln make it go away permanently?

Resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to return.

9. Are there any recalls or service bulletins related to the OBDII code P0686 in Lincolns?

It's recommended to check with your local dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or service bulletins related to this code.

10. Can I fix the OBDII code P0686 in my Lincoln myself, or should I take it to a professional mechanic?

While some DIY enthusiasts may be able to diagnose and repair the issue themselves, it is often recommended to seek the expertise of a professional mechanic, especially for electrical system repairs like this one.

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