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Engine-Codes – Mercury – P0687 Mercury

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

Quick Answer

The P0687 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Engine Control Module (ECM) power relay control circuit being in a high state. Common causes include Faulty power relay control circuit wiring, Defective power relay, 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
P0687 Mercury indicates Engine Control Module Power Relay Control Circuit High.
Common causes
Common causes include Faulty power relay control circuit wiring, Defective power relay, 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 P0687 Mercury Description

The P0687 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Engine Control Module (ECM) power relay control circuit being in a high state. This means that the ECM is not receiving the proper voltage or signal from the power relay control circuit, which can lead to a variety of performance issues in the vehicle.

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

Common Causes of P0687 Mercury

  1. Faulty power relay control circuit wiring
  2. Defective power relay
  3. Malfunctioning ECM
  4. Poor electrical connections
  5. Corrosion or damage to electrical components

Symptoms of P0687 Mercury

  1. Engine misfires or hesitation during acceleration
  2. Illumination of the Check Engine Light
  3. Reduced fuel efficiency
  4. Engine stalling or rough idling
  5. Difficulty starting the vehicle

How to Fix P0687 Mercury

  1. Diagnose the issue using a scan tool to read the DTC and pinpoint the exact cause of the problem.
  2. Inspect the power relay control circuit wiring for any damage or corrosion and repair or replace as needed.
  3. Test the power relay for proper operation and replace if faulty.
  4. Check the ECM for any signs of damage or malfunction and replace if necessary.
  5. Ensure all electrical connections are secure and free of debris or corrosion.

Cost to Fix P0687 Mercury

The typical repair costs for addressing a P0687 code on a Mercury vehicle can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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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 P0687 Mercury Code

1. What are the common symptoms of OBDII code P0687 in a Mercury vehicle?

- Common symptoms include engine stalling, rough idling, issues with starting the vehicle, and a decrease in overall engine performance.

2. What can cause the OBDII code P0687 in a Mercury car?

- The code P0687 is typically triggered by a malfunction in the engine control module power relay control circuit, often caused by a faulty relay, wiring issues, or a defective engine control module.

3. How can I diagnose the OBDII code P0687 in my Mercury vehicle?

- Diagnosing code P0687 usually involves checking the power relay, inspecting the wiring for any damage or loose connections, and testing the engine control module for proper functioning using a diagnostic scanner.

4. What are some repair tips for fixing the OBDII code P0687 in my Mercury car?

- Repair tips may include replacing the faulty power relay, repairing damaged wiring, or replacing the engine control module if it is found to be defective. It's recommended to follow the manufacturer's diagnostic and repair procedures.

5. Is it safe to continue driving my Mercury vehicle with the OBDII code P0687 present?

- It is not advisable to continue driving the vehicle with the code P0687 as it can lead to further engine issues and potential safety hazards. It's best to address the problem promptly to prevent any damage.

6. Can I reset the OBDII code P0687 in my Mercury car by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it will not fix the underlying issue causing the code to appear. It's important to diagnose and repair the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair the OBDII code P0687 in a Mercury vehicle?

- The cost of repairing the code P0687 can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It's recommended to consult a professional mechanic for an accurate estimate.

8. Can a DIY enthusiast fix the OBDII code P0687 in a Mercury car?

- While some experienced DIY enthusiasts may be able to diagnose and repair the code P0687 themselves, it is recommended to seek help from a qualified mechanic, especially when dealing with electrical components like relays and wiring.

9. Will the OBDII code P0687 cause my Mercury vehicle to fail an emissions test?

- Yes, the code P0687 can cause your vehicle to fail an emissions test as it indicates a problem with the engine control module power relay control circuit, which can affect the engine's performance and emissions output.

10. How often does the OBDII code P0687 occur in Mercury vehicles?

- The OBDII code P0687 is a relatively uncommon code in Mercury vehicles, but it can still occur due to various reasons such as aging components or electrical issues.

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