AutoCodes – GMC – P0689 2015 GMC Sierra

P0689 2015 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 2015 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 201

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0689 2015 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 2015 GMC Sierra - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com — P0689 2015 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0689 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P0689 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0689 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P0689 mean on a 2015 GMC Sierra?

P0689 indicates that the Electronic Control Module (ECM) has detected a low voltage condition in the power relay sense circuit.

2. What are the symptoms of code P0689 on a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine, stalling, low power, or the inability to start the vehicle at all.

3. What causes the P0689 code to appear on a 2015 GMC Sierra?

Common causes include a faulty ECM power relay, damaged wiring or connections in the power relay sense circuit, or a failing ECM.

4. Can a dead battery trigger the P0689 code on a 2015 GMC Sierra?

Yes, a weak or dead battery can cause low voltage issues, potentially triggering this code.

5. How can I diagnose the P0689 code on my 2015 GMC Sierra?

Start by checking the ECM power relay, inspecting wiring and connectors for damage, and testing circuit voltage with a multimeter.

6. Is it safe to drive with the P0689 code on a 2015 GMC Sierra?

Driving with this code is not recommended, as it may lead to stalling or complete engine failure while driving.

7. How do I fix the P0689 code on my 2015 GMC Sierra?

Repairs may include replacing the ECM power relay, repairing damaged wiring, or, in rare cases, replacing the ECM itself.

8. What tools are needed to troubleshoot the P0689 code?

Tools such as a multimeter, a scan tool, and a wiring diagram for the vehicle are essential for diagnosing this code.

9. Can a blown fuse cause the P0689 code on a 2015 GMC Sierra?

Yes, a blown fuse in the ECM power circuit can interrupt the power relay sense circuit and trigger this code.

10. How much does it cost to repair the P0689 code on a 2015 GMC Sierra?

Repair costs vary but may range from $50 to $200 for a new relay or wiring repair, while ECM replacement can cost $500 or more.

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