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

Quick Answer

The powertrain relay is a normally open relay. Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay. 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 Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay.
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.
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Code Popularity 269
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 19, 2022
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Code P0689 2014 GMC Sierra Description

The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The Engine Control Module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an Output Driver Module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.
OBDII Code P0689 2014 GMC Sierra - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com
P0689 2014 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low
What does this mean?

What are the Possible Causes of the DTC P0689 2014 GMC Sierra?

  • Weak battery
  • Low voltage while cranking
  • Faulty Engine Control Module (ECM) power relay
  • ECM power relay harness is open or shorted
  • ECM power relay circuit poor electrical connection
  • Blown ECM fuse
  • Faulty ECM

How to Fix the DTC P0689 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0689 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0689 2014 GMC Sierra code?

Need more information on how to fix the P0689 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0689 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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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