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

Quick Answer

The P0687 code for Saturn vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. Common causes include Faulty Engine Control Module power relay, Damaged wiring or connectors in the control circuit, Malfunctioning Engine Control Module. 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 Saturn indicates Engine Control Module Power Relay Control Circuit High.
Common causes
Common causes include Faulty Engine Control Module power relay, Damaged wiring or connectors in the control circuit, Malfunctioning Engine Control Module.
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 10, 2024
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Code P0687 Saturn Description

The P0687 code for Saturn vehicles indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. The Engine Control Module is a critical component of a vehicle's electronic control system, responsible for managing various engine functions. The power relay control circuit is designed to provide power to the ECM, allowing it to function properly. When this circuit's voltage is higher than normal, it can lead to issues with the ECM's operation.

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

Common Causes of P0687 Saturn

  1. Faulty Engine Control Module power relay
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning Engine Control Module
  4. Issues with the vehicle's battery or charging system

Symptoms of P0687 Saturn

  1. Rough idling or engine misfires
  2. Reduced acceleration and power
  3. Decreased fuel efficiency
  4. Engine stalling or difficulty starting
  5. Illuminated check engine light

How to Fix P0687 Saturn

  1. Begin by diagnosing the specific cause of the high voltage in the ECM power relay control circuit using a diagnostic scanner.
  2. Inspect the wiring and connectors associated with the control circuit for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the Engine Control Module power relay to ensure it is functioning correctly. Replace if faulty.
  4. If the ECM is found to be malfunctioning, it may need to be replaced and reprogrammed.
  5. Clear the diagnostic trouble codes from the vehicle's system and test drive to verify that the issue has been resolved.

Cost to Fix P0687 Saturn

The typical repair costs for addressing a P0687 code on a Saturn vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of parts such as an ECM power relay or wiring connectors may range from $50 to $200, while the labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue could range from $150 to $500. However, it is advisable to obtain a more accurate estimate by consulting with local auto repair shops, as rates can vary based on location and other factors.

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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 Saturn Code

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

- Common symptoms include engine stalling, difficulty starting the engine, poor engine performance, and illuminated Check Engine Light.

2. What does the OBDII code P0687 in a Saturn indicate?

- The code P0687 indicates a problem with the Engine Control Module Power Relay Control Circuit being too high.

3. What are the possible causes of OBDII code P0687 in a Saturn?

- Possible causes include a faulty engine control module power relay, damaged wiring or connectors in the power relay circuit, or a defective engine control module.

4. How can I diagnose the issue causing OBDII code P0687 in my Saturn?

- A thorough inspection of the engine control module power relay, wiring, and connectors is recommended. Testing the power relay and checking for any visible damage can help pinpoint the issue.

5. Can I drive my Saturn with OBDII code P0687 present?

- It is not recommended to drive your Saturn with OBDII code P0687 present, as it can lead to engine performance issues and potential stalling, which may compromise your safety.

6. How can I repair OBDII code P0687 in my Saturn?

- Repair options may include replacing the faulty engine control module power relay, repairing damaged wiring or connectors, or replacing the engine control module if necessary.

7. Is it possible to reset OBDII code P0687 in a Saturn without fixing the underlying issue?

- While clearing the code may temporarily turn off the Check Engine Light, the issue causing the code will persist and may lead to further problems if left unresolved.

8. Can a DIY enthusiast fix OBDII code P0687 in a Saturn?

- Depending on the root cause, a DIY enthusiast with automotive repair knowledge may be able to address the issue by replacing the power relay or repairing wiring. However, complex issues may require professional assistance.

9. How much does it cost to repair OBDII code P0687 in a Saturn?

- Repair costs can vary based on the cause of the issue and whether professional assistance is needed. Costs may include parts and labor, ranging from a few hundred to over a thousand dollars.

10. How long can I safely drive with OBDII code P0687 in my Saturn before getting it repaired?

- It is recommended to address OBDII code P0687 in your Saturn as soon as possible to prevent potential engine performance issues and further damage. Driving with this code present may lead to more severe problems over time.

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