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

Quick Answer

The P0689 code for Chevrolet vehicles indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being too low. Common causes include Faulty ECM power relay, Faulty wiring or connectors in the power relay sense circuit, Corrosion or damage to the power relay connections. 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 Chevrolet indicates Electronic Control Module Power Relay Sense Circuit Low.
Common causes
Common causes include Faulty ECM power relay, Faulty wiring or connectors in the power relay sense circuit, Corrosion or damage to the power relay connections.
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 P0689 Chevrolet Description

The P0689 code for Chevrolet vehicles indicates a problem with the Electronic Control Module (ECM) Power Relay Sense Circuit being too low. The ECM power relay is responsible for supplying power to the ECM, which is a crucial component that controls the engine's operation, fuel delivery, ignition timing, and other vital functions. When the power relay sense circuit detects a low voltage situation, it can lead to a variety of issues that can affect the vehicle's performance and drivability.

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

Common Causes of P0689 Chevrolet

  1. Faulty ECM power relay
  2. Faulty wiring or connectors in the power relay sense circuit
  3. Corrosion or damage to the power relay connections
  4. Electrical issues in the vehicle's wiring harness
  5. ECM software or hardware issues

Symptoms of P0689 Chevrolet

  1. Check Engine Light illuminated on the dashboard
  2. Engine running rough or misfiring
  3. Decreased fuel efficiency
  4. Difficulty starting the vehicle
  5. Loss of engine power

How to Fix P0689 Chevrolet

  1. Use a diagnostic scanner to retrieve the fault code and pinpoint the exact cause of the issue.
  2. Inspect the ECM power relay and its connections for any signs of damage or corrosion.
  3. Test the power relay sense circuit for proper voltage and continuity.
  4. Replace the ECM power relay if it is found to be faulty.
  5. Clear the fault code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0689 Chevrolet

The cost of repairing the P0689 code for Chevrolet vehicles can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing an ECM power relay can range from $100 to $300, including parts and labor. However, the total cost may be higher if additional electrical components or wiring repairs are needed. It is recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0689 Chevrolet









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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.

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