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Engine-Codes – Generic – P0687

P0687 Code - Engine Control Module Power Relay Control Circuit High

Quick Answer

The P0687 diagnostic trouble code (DTC) refers to the Engine Control Module (ECM) Power Relay Control Circuit High. Common causes include Malfunctioning power relay, Wiring issues (shorts, open circuits), Faulty 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
P0687 indicates Engine Control Module Power Relay Control Circuit High.
Common causes
Common causes include Malfunctioning power relay, Wiring issues (shorts, open circuits), Faulty 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 08, 2024
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Code P0687 Description

The P0687 diagnostic trouble code (DTC) refers to the Engine Control Module (ECM) Power Relay Control Circuit High. This code indicates that there is an issue with the power relay control circuit that supplies power to the ECM. The ECM is a crucial component in the vehicle's engine management system, as it controls various functions such as fuel injection, ignition timing, and emissions control. When the power relay control circuit is detected to be operating at a higher voltage level than normal, it can lead to malfunctions in the ECM's operation.

OBDII Code P0687 - Engine Control Module Power Relay Control Circuit High
P0687 Code - Engine Control Module Power Relay Control Circuit High

Common Causes of P0687

  1. Malfunctioning power relay
  2. Wiring issues (shorts, open circuits)
  3. Faulty ECM
  4. Electrical system problems
  5. Corrosion or poor connections in the power relay circuit

Symptoms of P0687

  1. Engine misfires
  2. Rough idling
  3. Stalling
  4. Decreased fuel efficiency
  5. Difficulty starting the engine

How to Fix P0687

  1. Diagnose the issue by using a scan tool to confirm the P0687 code and check the power relay control circuit for abnormalities.
  2. Inspect the power relay for any signs of damage or malfunction and replace it if necessary.
  3. Check the wiring in the power relay control circuit for shorts, open circuits, or corrosion, and repair or replace as needed.
  4. Test the ECM to ensure it is functioning properly and replace it if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0687

The typical repair costs for addressing a P0687 DTC can vary depending on the specific cause of the issue and the labor rates at the repair shop. In general, the cost of replacing a power relay can range from $50 to $150, while diagnosing and repairing wiring issues may cost between $100 to $300. If the ECM needs to be replaced, the cost can be higher, ranging from $200 to $500 or more. Overall, the total repair cost for resolving a P0687 code can range from $150 to $800 or more, depending on the extent of the repairs needed. It's recommended to consult with a qualified mechanic or repair shop to get an accurate estimate based on the specific circumstances of your vehicle.

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Code P0687 Information for Specific Makes

  • P0687 Audi — Engine Control Module Power Relay Control Circuit High
  • P0687 BMW — Engine Control Module Power Relay Control Circuit High
  • P0687 Buick — Engine Control Module Power Relay Control Circuit High
  • P0687 Cadillac — Engine Control Module Power Relay Control Circuit High
  • P0687 Chevrolet — Engine Control Module Power Relay Control Circuit High
  • P0687 Chrysler — Engine Control Module Power Relay Control Circuit High
  • P0687 Dodge — Engine Control Module Power Relay Control Circuit High
  • P0687 Ford — Engine Control Module Power Relay Control Circuit High
  • P0687 GMC — Engine Control Module Power Relay Control Circuit High
  • P0687 Isuzu — Engine Control Module Power Relay Control Circuit High
  • P0687 Jeep — Engine Control Module Power Relay Control Circuit High
  • P0687 Lincoln — Engine Control Module Power Relay Control Circuit High
  • P0687 Mercury — Engine Control Module Power Relay Control Circuit High
  • P0687 MINI — Engine Control Module Power Relay Control Circuit High
  • P0687 Pontiac — Engine Control Module Power Relay Control Circuit High
  • P0687 Saturn — Engine Control Module Power Relay Control Circuit High
  • P0687 Suzuki — Engine Control Module Power Relay Control Circuit High
  • P0687 Volkswagen — Engine Control Module Power Relay Control Circuit High
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 P0687 Code

1. What are the common symptoms of OBDII code P0687?

- Common symptoms of P0687 include rough idling, engine stalling, difficulty starting the vehicle, and illuminated Check Engine light.

2. What causes the OBDII code P0687 to be triggered?

- The code P0687 is triggered when the Engine Control Module (ECM) detects a high voltage condition in the power relay control circuit.

3. How can I diagnose the cause of OBDII code P0687?

- To diagnose P0687, you can start by checking the power relay, wiring connections, and the ECM for any faults or damages.

4. Can a faulty battery cause OBDII code P0687 to appear?

- Yes, a weak or faulty battery can sometimes trigger code P0687 due to insufficient power supply to the ECM.

5. Is it safe to continue driving with OBDII code P0687 present?

- It is not recommended to continue driving with code P0687 present, as it can lead to further issues and potential damage to the engine control system.

6. How can I repair OBDII code P0687?

- Repairing code P0687 typically involves replacing the faulty power relay, repairing any damaged wiring, or addressing any issues with the ECM.

7. Are there any DIY tips for fixing OBDII code P0687?

- DIY tips for fixing P0687 include checking and cleaning the power relay contacts, ensuring proper wiring connections, and testing the battery voltage.

8. Can a mechanic reset the OBDII code P0687 after repairs are made?

- Yes, a mechanic can reset the code P0687 using a diagnostic scanner after repairing the underlying issue to clear the Check Engine light.

9. What are the potential risks of ignoring OBDII code P0687?

- Ignoring code P0687 can lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.

10. Is it necessary to visit a mechanic for OBDII code P0687 diagnosis and repair?

- While some DIY troubleshooting is possible, it is recommended to visit a mechanic for a proper diagnosis and repair of code P0687 to ensure the issue is resolved correctly.

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