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Engine-Codes – Lincoln – P0687 Lincoln

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

Quick Answer

The P0687 code for Lincoln vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, 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 Lincoln indicates Engine Control Module Power Relay Control Circuit High.
Common causes
Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, 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 Lincoln Description

The P0687 code for Lincoln vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. The ECM power relay is responsible for providing power to the engine control module, which is a crucial component that controls various functions within the vehicle, such as fuel injection, ignition timing, and emissions systems. When the power relay control circuit is registering as too high, it means that there is an issue with the voltage levels or resistance in the circuit, potentially leading to malfunctions in the ECM's operation.

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

Common Causes of P0687 Lincoln

  1. Faulty ECM power relay
  2. Damaged wiring or connectors in the power relay circuit
  3. Malfunctioning ECM
  4. Issues with the vehicle's battery or charging system
  5. Corrosion or moisture affecting the power relay circuit

Symptoms of P0687 Lincoln

  1. Engine misfires or rough idling
  2. Reduced engine power or acceleration
  3. Check Engine light illuminated on the dashboard
  4. Vehicle stalling or difficulty starting
  5. Poor fuel efficiency

How to Fix P0687 Lincoln

  1. Begin by conducting a thorough inspection of the ECM power relay and its associated wiring and connectors for any visible damage or corrosion.
  2. Test the voltage levels in the power relay circuit using a multimeter to identify any irregularities that may be causing the high voltage reading.
  3. Replace the ECM power relay if it is found to be faulty, ensuring to use a compatible replacement part recommended for Lincoln vehicles.
  4. Repair or replace any damaged wiring or connectors in the power relay circuit to ensure a secure and reliable connection.
  5. Clear the diagnostic trouble codes from the vehicle's ECM using an OBD-II scanner to reset the system and verify that the issue has been resolved.

Cost to Fix P0687 Lincoln

The typical repair costs for addressing a P0687 code in a Lincoln vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing the ECM power relay and addressing any wiring issues may cost between $150 to $400, including parts and labor. However, it is essential to consider that diagnostic time and labor rates at auto repair shops can fluctuate based on various factors, so it is advisable to consult with a trusted mechanic for a more accurate estimate based on your vehicle's make and model.

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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 Lincoln Code

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

- Common symptoms include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine Light.

2. What can cause the OBDII code P0687 in a Lincoln to trigger?

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

3. How serious is the OBDII code P0687 in a Lincoln?

- While the vehicle may still operate, it is important to address the issue promptly to prevent potential damage to the ECM or other components.

4. How can I diagnose the cause of OBDII code P0687 in a Lincoln?

- A diagnostic scan tool can help pinpoint the exact cause by reading the code, checking related sensors and circuits, and testing the power relay.

5. What are some possible repair tips for resolving OBDII code P0687 in a Lincoln?

- Inspect and test the power relay, check for loose wiring connections, ensure proper ECM grounding, and replace any faulty components as necessary.

6. Can I drive my Lincoln with the OBDII code P0687 present?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to further electrical issues and potential engine performance problems.

7. Will resetting the OBDII code P0687 in my Lincoln make it go away permanently?

- Simply resetting the code may temporarily turn off the Check Engine Light, but the underlying issue causing the code will likely reoccur if not properly addressed.

8. How much does it typically cost to repair OBDII code P0687 in a Lincoln?

- The cost of repair can vary depending on the specific cause of the code, but it may range from around $100 for a simple relay replacement to several hundred dollars for more extensive repairs.

9. Can a DIY enthusiast fix OBDII code P0687 in a Lincoln themselves?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to address the issue by following repair guides and tutorials, but professional help is recommended for complex cases.

10. Is it necessary to visit a dealership for OBDII code P0687 repairs in a Lincoln?

- While a dealership may have specialized knowledge and parts for Lincoln vehicles, independent repair shops and skilled mechanics can also effectively diagnose and repair this code.

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