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P0689 Mitsubishi Code - Electronic Control Module Power Relay Sense Circuit Low

Quick Answer

The P0689 code for Mitsubishi vehicles indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being detected as low. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, Corrosion or poor connections in the power relay 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 Mitsubishi indicates Electronic Control Module Power Relay Sense Circuit Low.
Common causes
Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, Corrosion or poor connections in the power relay 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 Aug 18, 2024
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Code P0689 Mitsubishi Description

The P0689 code for Mitsubishi vehicles indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being detected as low. The ECM power relay is responsible for providing power to the ECM, which is the central control unit for the vehicle's engine management system. When the sense circuit is detected as low, it means that there may be an issue with the power supply to the ECM, potentially leading to malfunctions in the engine control system.

OBDII Code P0689 Mitsubishi - Electronic Control Module Power Relay Sense Circuit Low
P0689 Mitsubishi Code - Electronic Control Module Power Relay Sense Circuit Low

Common Causes of P0689 Mitsubishi

  1. Faulty ECM power relay
  2. Damaged wiring or connectors in the power relay circuit
  3. Corrosion or poor connections in the power relay circuit
  4. ECM software or hardware issues
  5. Electrical system malfunctions

Symptoms of P0689 Mitsubishi

  1. Check Engine Light illuminated on the dashboard
  2. Engine misfires or rough idling
  3. Difficulty starting the engine
  4. Reduced engine power or acceleration
  5. Vehicle stalling or shutting off unexpectedly

How to Fix P0689 Mitsubishi

  1. Inspect the ECM power relay and replace if faulty
  2. Check the wiring and connectors in the power relay circuit for damage or corrosion
  3. Repair or replace any damaged wiring or connectors
  4. Perform a thorough diagnostic scan to check for ECM software or hardware issues
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved

Cost to Fix P0689 Mitsubishi

The typical repair costs for addressing the P0689 code in a Mitsubishi vehicle can range from $150 to $400, including parts and labor. However, it is important to note that the actual cost may vary depending on the specific diagnosis time and labor rates at auto repair shops. Factors such as the vehicle make and model, engine type, and location can also influence the overall repair costs. It is advisable to contact local auto repair shops for a more accurate estimate based on individual circumstances.

What does this mean?

Tech Notes for P0689 Mitsubishi

Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

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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 Mitsubishi Code

1. What are the common symptoms of OBDII code P0689 in a Mitsubishi related to the Electronic Control Module Power Relay Sense Circuit Low?

The common symptoms include engine stalling, difficulty starting the vehicle, and illuminated Check Engine Light.

2. What are the potential causes of the OBDII code P0689 in a Mitsubishi?

Potential causes of this code include a faulty electronic control module power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Electronic Control Module Power Relay Sense Circuit Low issue in my Mitsubishi?

Diagnosis involves using a multimeter to test the power relay, inspecting the wiring and connectors for any damage, and checking the ECM for proper functioning. It is recommended to consult a professional mechanic for accurate diagnosis.

4. Can I still drive my Mitsubishi with the OBDII code P0689 present?

It is not recommended to drive your Mitsubishi with this code present, as it can lead to engine performance issues and potential stalling. It is best to address the issue promptly to avoid further damage.

5. How can I repair the Electronic Control Module Power Relay Sense Circuit Low problem in my Mitsubishi?

Repairing this issue may involve replacing the faulty power relay, repairing damaged wiring or connectors, or reprogramming the ECM. It is advised to seek assistance from a qualified technician for proper repair.

6. What are some DIY tips for troubleshooting the OBDII code P0689 in a Mitsubishi?

You can start by checking the power relay fuse, inspecting the wiring for any visible damage, and ensuring all connectors are securely attached. If you are comfortable with electrical work, you may attempt to test the power relay using a multimeter.

7. Will resetting the Check Engine Light resolve the OBDII code P0689 in my Mitsubishi?

Resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing the code. It is essential to diagnose and address the root cause of the problem to prevent it from reoccurring.

8. How much does it typically cost to repair the Electronic Control Module Power Relay Sense Circuit Low in a Mitsubishi?

The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to obtain quotes from different repair shops to compare prices.

9. Can a low battery voltage trigger the OBDII code P0689 in a Mitsubishi?

Low battery voltage can potentially cause issues with the power relay circuit and trigger this code. It is essential to ensure the battery is in good condition and properly charged to prevent such issues.

10. Is the OBDII code P0689 specific to Mitsubishi vehicles only?

While this specific code may be more common in Mitsubishi vehicles, it can also occur in other car makes and models. The diagnostic process and repair steps may vary depending on the vehicle manufacturer.

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