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P0689 2010 Ford Fusion Code - Electronic Control Module Power Relay Sense Circuit Low

Quick Answer

The P0689 diagnostic trouble code (DTC) for a 2010 Ford Fusion indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being low. Common causes include Faulty ECM Power Relay: A malfunctioning ECM power relay can cause the voltage in the sense circuit to drop, triggering the P0689 code, Damaged Wiring or Connectors: Corrosion, fraying, or loose connections in the sense circuit wiring can disrupt the voltage supply to the ECM, Malfunctioning ECM: A defective ECM itself could be the root cause of the issue, leading to voltage irregularities in the sense circuit. 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
P0689 2010 Ford Fusion indicates Electronic Control Module Power Relay Sense Circuit Low.
Common causes
Common causes include Faulty ECM Power Relay: A malfunctioning ECM power relay can cause the voltage in the sense circuit to drop, triggering the P0689 code, Damaged Wiring or Connectors: Corrosion, fraying, or loose connections in the sense circuit wiring can disrupt the voltage supply to the ECM, Malfunctioning ECM: A defective ECM itself could be the root cause of the issue, leading to voltage irregularities in the sense circuit.
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 17, 2024
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Code P0689 2010 Ford Fusion Description

The P0689 diagnostic trouble code (DTC) for a 2010 Ford Fusion indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being low. The ECM power relay is responsible for supplying power to the ECM, which is the brain of the vehicle's engine management system. The sense circuit is a feedback loop that monitors the voltage supplied to the ECM. When the voltage in this circuit is lower than expected, the ECM detects a fault and triggers the P0689 code.

OBDII Code P0689 2010 Ford Fusion - Electronic Control Module Power Relay Sense Circuit Low
P0689 2010 Ford Fusion Code - Electronic Control Module Power Relay Sense Circuit Low

Common Causes of P0689 2010 Ford Fusion

  1. Faulty ECM Power Relay: A malfunctioning ECM power relay can cause the voltage in the sense circuit to drop, triggering the P0689 code.
  2. Damaged Wiring or Connectors: Corrosion, fraying, or loose connections in the sense circuit wiring can disrupt the voltage supply to the ECM.
  3. Malfunctioning ECM: A defective ECM itself could be the root cause of the issue, leading to voltage irregularities in the sense circuit.
  4. Battery or Charging System Issues: Problems with the vehicle's battery or charging system can affect the voltage supplied to the ECM, resulting in the P0689 code.
  5. ECM Software Update: In some cases, an outdated ECM software version may cause communication issues and trigger the P0689 code.

Symptoms of P0689 2010 Ford Fusion

  1. Check Engine Light: The most common symptom associated with the P0689 code is the illumination of the Check Engine Light on the dashboard.
  2. Engine Stalling: The vehicle may experience intermittent stalling or rough idling due to the ECM not receiving the proper voltage.
  3. Reduced Power: The engine may lack power or responsiveness, especially during acceleration.
  4. Poor Fuel Efficiency: A decrease in fuel efficiency may be noticed as a result of the ECM not functioning correctly.
  5. Failure to Start: In severe cases, the vehicle may fail to start if the ECM power relay sense circuit issue is severe.

How to Fix P0689 2010 Ford Fusion

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the ECM power relay, wiring, and connectors.
  2. Test the ECM Power Relay: Check the functionality of the ECM power relay and replace it if necessary.
  3. Inspect Wiring and Connectors: Examine the wiring and connectors in the sense circuit for any damage or corrosion, repairing or replacing as needed.
  4. Check ECM Functionality: Test the ECM for proper operation and consider reprogramming or replacing it if deemed faulty.
  5. Clear Codes and Test Drive: Clear the trouble codes from the ECM memory, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0689 2010 Ford Fusion

The typical repair costs for addressing the P0689 code on a 2010 Ford Fusion can vary depending on the specific cause of the issue. In general, replacing the ECM power relay may cost between $50 and $150, while repairing damaged wiring or connectors could range from $100 to $300. If the ECM itself needs to be replaced, the cost can be significantly higher, potentially exceeding $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, with additional charges for diagnostic time and any necessary programming. It is advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific needs and location.

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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 P0689 2010 Ford Fusion Code

1. What are the common symptoms of OBDII code P0689 in a 2010 Ford Fusion?

The common symptoms include engine stalling, difficulty starting the vehicle, and illumination of the check engine light.

2. What does the OBDII code P0689 "Electronic Control Module Power Relay Sense Circuit Low" indicate in a 2010 Ford Fusion?

This code indicates that the power relay sense circuit for the Electronic Control Module (ECM) is detecting a low voltage condition.

3. What are the possible causes of OBDII code P0689 in a 2010 Ford Fusion?

Possible causes include a faulty ECM power relay, damaged wiring or connectors in the power relay circuit, or a defective ECM.

4. How can I diagnose the issue causing OBDII code P0689 in my 2010 Ford Fusion?

You can diagnose the issue by checking the power relay for proper functioning, inspecting the wiring and connectors for damage, and testing the ECM for faults using a diagnostic tool.

5. Can I still drive my 2010 Ford Fusion with OBDII code P0689 present?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety risks due to potential engine stalling.

6. How can I repair OBDII code P0689 in my 2010 Ford Fusion?

Repair options include replacing the faulty ECM power relay, repairing any damaged wiring or connectors, or replacing the ECM if deemed necessary.

7. Can a DIY enthusiast fix OBDII code P0689 in a 2010 Ford Fusion?

DIY enthusiasts with automotive repair experience can attempt to fix this issue by following repair guides, but it is recommended to have the necessary tools and knowledge to work on the vehicle's electrical components safely.

8. Is resetting the fault codes enough to address OBDII code P0689 in a 2010 Ford Fusion?

Simply resetting the fault codes may temporarily clear the check engine light, but it will not fix the underlying issue causing the code. It is crucial to diagnose and repair the root cause.

9. What should I do if OBDII code P0689 keeps coming back in my 2010 Ford Fusion after repairs?

If the code keeps reoccurring after repairs, it may indicate a persistent issue with the ECM power relay or wiring. Further diagnostic testing and inspection are recommended to identify and address the problem.

10. How much does it cost to repair OBDII code P0689 in a 2010 Ford Fusion at a professional auto repair shop?

The cost of repairing this code can vary depending on the extent of the issue, parts needed, and labor rates. It is advisable to consult with a trusted auto repair shop for an accurate estimate.

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