AutoCodes – GMC – P0689 GMC

P0689 GMC 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 GMC 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 3,430

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 GMC 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 GMC - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com — P0689 GMC Code - Electronic Control Module Power Relay Sense Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0689 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

P0689 2014 GMC Sierra — Electronic Control Module Power Relay Sense Circuit Low
P0689 2015 GMC Sierra — Electronic Control Module Power Relay Sense Circuit Low
P0689 2016 GMC Sierra — Electronic Control Module Power Relay Sense Circuit Low
P0689 2017 GMC Sierra — Electronic Control Module Power Relay Sense Circuit Low
P0689 2018 GMC Sierra — Electronic Control Module Power Relay Sense Circuit Low

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 GMC Code

1. What are the common symptoms of OBDII code P0689 in a GMC vehicle?

- Common symptoms include engine stalling, rough idling, poor acceleration, and possible illumination of the Check Engine Light.

2. What can cause the Electronic Control Module Power Relay Sense Circuit Low code in a GMC?

- The code P0689 can be triggered by a faulty electronic control module power relay, damaged wiring or connectors in the circuit, or a defective electronic control module itself.

3. How can I diagnose the cause of OBDII code P0689 in my GMC?

- To diagnose the issue, you can perform a visual inspection of the wiring and connectors, test the electronic control module power relay, and use a multimeter to check for proper voltage in the circuit.

4. Can a DIY enthusiast repair the Electronic Control Module Power Relay Sense Circuit Low code?

- Depending on your skill level and tools available, you may be able to repair this code yourself by replacing the faulty relay, repairing damaged wiring, or addressing any connector issues.

5. Is it safe to continue driving with OBDII code P0689 present in a GMC vehicle?

- It is not recommended to drive with this code present, as it can lead to further engine issues and potential safety hazards. It's best to address the problem as soon as possible.

6. Will resetting the OBDII code P0689 make it go away permanently?

- Simply resetting the code may temporarily clear the Check Engine Light, but if the underlying issue causing the code is not fixed, it is likely to return.

7. How much does it typically cost to repair OBDII code P0689 in a GMC?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from $100 to $300 for parts and labor.

8. Are there any preventive measures to avoid OBDII code P0689 in a GMC?

- Regularly checking and maintaining the electrical components in your vehicle, such as relays and wiring, can help prevent issues that may trigger this code.

9. Can a low battery voltage cause the Electronic Control Module Power Relay Sense Circuit Low code?

- Yes, low battery voltage can potentially cause this code to appear, so it's important to ensure that your vehicle's battery is in good condition.

10. How long does it usually take to repair OBDII code P0689 in a GMC?

- The repair time can vary depending on the exact cause of the code and the availability of parts, but it typically takes a few hours to complete the necessary repairs.