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

Quick Answer

The P0686 code in a Chevrolet vehicle indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit. Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Corrosion or loose connections in the circuit. 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 Chevrolet indicates Engine Control Module Power Relay Control Circuit Low.
Common causes
Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Corrosion or loose connections in the circuit.
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 Chevrolet Description

The P0686 code in a Chevrolet vehicle indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit. The ECM, also known as the engine control unit, is a crucial component that manages various functions within the vehicle, such as fuel delivery, ignition timing, and emissions control. The power relay control circuit is responsible for supplying power to the ECM, allowing it to function properly.

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

Common Causes of P0686 Chevrolet

  1. Faulty ECM power relay
  2. Wiring issues in the power relay control circuit
  3. Corrosion or loose connections in the circuit
  4. ECM software malfunction
  5. Electrical system faults

Symptoms of P0686 Chevrolet

  1. Engine misfires
  2. Poor fuel efficiency
  3. Rough idling
  4. Stalling
  5. Illuminated check engine light

How to Fix P0686 Chevrolet

  1. Use an OBD-II scanner to diagnose the specific cause of the P0686 code.
  2. Inspect the ECM power relay and related wiring for any visible damage or loose connections.
  3. Test the power relay control circuit for proper voltage and continuity.
  4. Replace the faulty ECM power relay or repair any damaged wiring as needed.
  5. Clear the trouble code from the vehicle's ECM and perform a road test to ensure the issue has been resolved.

Cost to Fix P0686 Chevrolet

The cost of repairing a P0686 code in a Chevrolet vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this type of problem can range from $100 to $300, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's recommended to obtain quotes from multiple sources to get a more accurate estimate.

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Information for Specific Chevrolet Models

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 Chevrolet Code

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

- Common symptoms include engine stalling, poor engine performance, difficulty starting the vehicle, and illuminated check engine light.

2. What usually causes the OBDII code P0686 in a Chevrolet?

- The code is typically caused by a faulty engine control module power relay or issues with the power relay control circuit being low.

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

- Diagnosing the code involves checking the engine control module power relay, inspecting the power relay control circuit for any faults, and testing the relay's functionality.

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

- While some enthusiasts may have the skills to diagnose and replace the faulty relay, it is recommended to seek professional help for accurate diagnosis and repair.

5. Is it safe to continue driving with the OBDII code P0686 in a Chevrolet?

- It is not recommended to drive the vehicle with this code as it can lead to further engine issues and potential safety hazards. It is best to address the problem promptly.

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

- The cost of repair can vary depending on the extent of the issue and the labor rates in your area. It is advisable to get a few quotes from reputable mechanics.

7. Are there any preventive measures to avoid OBDII code P0686 in a Chevrolet?

- Regular maintenance of the vehicle's electrical system, including checking and replacing relays as needed, can help prevent issues that trigger this code.

8. Can a weak battery or alternator cause the OBDII code P0686 in a Chevrolet?

- A weak battery or alternator can sometimes lead to electrical issues that trigger this code. It is advisable to ensure the battery and alternator are in good condition.

9. Will resetting the OBDII code P0686 in a Chevrolet make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but it will reappear if the underlying issue causing the code is not addressed and fixed.

10. Can a bad ground connection contribute to the OBDII code P0686 in a Chevrolet?

- Yes, a bad ground connection can disrupt the power relay control circuit and lead to the triggering of this code. It is essential to check and maintain proper ground connections.

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