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

Quick Answer

The P0686 code for Dodge vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being lower than the normal range. Common causes include Faulty ECM power relay, Wiring issues in the power relay circuit, Loose or corroded electrical connections. 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 Dodge indicates Engine Control Module Power Relay Control Circuit Low.
Common causes
Common causes include Faulty ECM power relay, Wiring issues in the power relay circuit, Loose or corroded electrical connections.
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 06, 2024
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Code P0686 Dodge Description

The P0686 code for Dodge vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being lower than the normal range. The ECM power relay is responsible for providing power to the ECM, which is crucial for the proper functioning of the engine and various vehicle systems. When the control circuit is detected to be low, it can result in issues with the engine's performance, fuel efficiency, and overall drivability.

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

Common Causes of P0686 Dodge

  1. Faulty ECM power relay
  2. Wiring issues in the power relay circuit
  3. Loose or corroded electrical connections
  4. ECM software or programming issues
  5. Battery or alternator problems affecting power supply

Symptoms of P0686 Dodge

  1. Rough idling or running
  2. Engine stalling or hesitation
  3. Difficulty starting the engine
  4. Engine may fail to start
  5. Reduced fuel efficiency

How to Fix P0686 Dodge

  1. Begin by inspecting the ECM power relay and related wiring for any visible damage or corrosion.
  2. Test the power relay using a multimeter to check for proper functionality.
  3. Check and clean any electrical connectors or terminals that may be loose or corroded.
  4. Verify the ECM software and programming are up to date and reflash if necessary.
  5. If the issue persists, consider replacing the ECM power relay or seeking professional assistance for further diagnosis.

Cost to Fix P0686 Dodge

The typical repair costs for addressing the P0686 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the ECM power relay or addressing wiring issues may cost between $100 to $300 for parts and labor. However, it's advisable to check with local auto repair shops for a more accurate estimate based on your vehicle make and model. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause 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 P0686 Dodge Code

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

The common symptoms of OBDII code P0686 in a Dodge vehicle include engine stalling, difficulty starting the engine, and poor engine performance.

2. What causes the OBDII code P0686 in a Dodge vehicle?

The OBDII code P0686 in a Dodge vehicle is typically caused by a faulty engine control module (ECM) power relay or issues with the power relay control circuit.

3. How can I diagnose the OBDII code P0686 in my Dodge vehicle?

Diagnosing the OBDII code P0686 in a Dodge vehicle involves checking the engine control module power relay, inspecting the power relay control circuit for any damage or loose connections, and testing the relay's functionality.

4. Can a DIY enthusiast repair the OBDII code P0686 in a Dodge vehicle?

While some DIY enthusiasts may be able to replace the faulty engine control module power relay themselves, diagnosing and repairing issues related to the power relay control circuit may require professional automotive expertise.

5. Is it safe to continue driving my Dodge vehicle with the OBDII code P0686?

It is not recommended to continue driving your Dodge vehicle with the OBDII code P0686, as it can lead to further engine performance issues and potential stalling, which may compromise your safety on the road.

6. How much does it typically cost to repair the OBDII code P0686 in a Dodge vehicle?

The cost of repairing the OBDII code P0686 in a Dodge vehicle can vary depending on the extent of the issue, the specific model of the vehicle, and whether professional labor is required. It is advisable to consult a mechanic for an accurate estimate.

7. Can a weak battery cause the OBDII code P0686 in a Dodge vehicle?

Yes, a weak battery can potentially trigger the OBDII code P0686 in a Dodge vehicle, as inadequate power supply may affect the operation of the engine control module power relay.

8. Are there any preventive measures to avoid the OBDII code P0686 in my Dodge vehicle?

Regular maintenance, such as checking the battery's condition and ensuring proper electrical connections, can help prevent issues that may lead to the OBDII code P0686 in a Dodge vehicle.

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

The repair time for the OBDII code P0686 in a Dodge vehicle can vary depending on the specific issue and the availability of parts. It is advisable to consult a mechanic for a more accurate timeframe.

10. Can a reset of the vehicle's ECM clear the OBDII code P0686 in a Dodge vehicle?

While resetting the vehicle's ECM may temporarily clear the OBDII code P0686, it is important to address the underlying issue with the engine control module power relay or power relay control circuit to prevent the code from reappearing.

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