AutoCodes – Mercury – P0687 Mercury

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

Quick Answer

The Engine Control Module (ECM) monitors the power inputs. Common causes include Faulty Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay circuit poor electrical connection. 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 Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay circuit poor electrical connection.
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.

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Code Popularity 1,094

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0687 Mercury Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM detects a high power voltage input.

OBDII Code P0687 Mercury - Engine Control Module Power Relay Control Circuit High - AutoCodes.com — P0687 Mercury Code - Engine Control Module Power Relay Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0687 Mercury?

Faulty Engine Control Module (ECM) power relay
ECM power relay harness is open or shorted
ECM power relay circuit poor electrical connection
Faulty ECM

How to Fix the DTC P0687 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0687 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0687 Mercury code?

Need more information on how to fix the P0687 Mercury code? Get Access to Factory Service Manuals

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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.