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P0689 2014 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low

Quick Answer

The P0689 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being low. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay sense circuit, Corrosion or poor connections in the 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 2014 GMC Sierra 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 sense circuit, Corrosion or poor connections in the 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 18, 2024
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Code P0689 2014 GMC Sierra Description

The P0689 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being low. The ECM is a crucial component of the vehicle's engine management system, responsible for controlling various functions such as fuel injection, ignition timing, and emissions. The power relay sense circuit is designed to monitor the voltage level of the ECM power supply, ensuring that it remains within the specified range for proper operation.

OBDII Code P0689 2014 GMC Sierra - Electronic Control Module Power Relay Sense Circuit Low
P0689 2014 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low

Common Causes of P0689 2014 GMC Sierra

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

Symptoms of P0689 2014 GMC Sierra

  1. Engine stalling or rough idling
  2. Poor acceleration or loss of power
  3. Decreased fuel efficiency
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P0689 2014 GMC Sierra

  1. Begin by conducting a thorough inspection of the ECM power relay and the wiring connecting it to the ECM. Look for any visible damage, corrosion, or loose connections.
  2. Test the ECM power relay using a multimeter to check for proper functionality. Replace the relay if it is found to be faulty.
  3. Inspect the wiring in the power relay sense circuit for any damage or breaks. Repair or replace any damaged wiring as necessary.
  4. Clear the DTC using a scan tool after completing the repairs and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying ECM software issues or electrical system malfunctions.

Cost to Fix P0689 2014 GMC Sierra

The typical repair costs for addressing the P0689 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty ECM power relay or repairing damaged wiring may cost between $150 to $300, including parts and labor. However, additional diagnostic time and labor rates at auto repair shops can influence the overall cost. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your location and vehicle specifications. Labor rates at auto repair shops commonly range between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops.

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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 2014 GMC Sierra Code

1. What does the OBDII code P0689 mean on a 2014 GMC Sierra?

P0689 indicates that the Electronic Control Module (ECM) power relay sense circuit is reading a voltage lower than expected, which can affect the ECM’s functionality.

2. What are the common symptoms of the P0689 code in a 2014 GMC Sierra?

Symptoms include the engine not starting, intermittent stalling, reduced power, or the Check Engine Light illuminating.

3. What causes the P0689 code in a 2014 GMC Sierra?

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

4. Can a bad battery cause the P0689 code in my GMC Sierra?

Yes, a weak or failing battery can cause low voltage in the ECM power relay sense circuit, potentially triggering the P0689 code.

5. How do I diagnose the P0689 code on a 2014 GMC Sierra?

Start by inspecting the ECM power relay, related wiring, and connectors for damage or corrosion. Test the relay and check voltage levels in the circuit using a multimeter.

6. Can I drive with the P0689 code on my GMC Sierra?

Driving with this code is not recommended, as it can lead to stalling or prevent the engine from starting, which poses safety risks.

7. How can I fix the P0689 code on a 2014 GMC Sierra?

Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if necessary.

8. How much does it cost to fix the P0689 code on a GMC Sierra?

The cost depends on the specific repair, ranging from about $20 for a new relay to several hundred dollars if ECM replacement or reprogramming is needed.

9. Can a blown fuse cause the P0689 code in my 2014 GMC Sierra?

Yes, a blown fuse in the ECM power relay circuit can disrupt the voltage and trigger the P0689 code.

10. Do I need to reprogram the ECM if I replace the power relay for P0689?

In most cases, reprogramming is not required when replacing the relay, but it may be necessary if the ECM itself is replaced.

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