AutoCodes – GMC – P0689 2016 GMC Sierra

P0689 2016 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 2016 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 1,069

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 2016 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 2016 GMC Sierra - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com — P0689 2016 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0689 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P0689 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0689 2016 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 2016 GMC Sierra Code

1. What does OBDII code P0689 mean on a 2016 GMC Sierra?

P0689 indicates that the Electronic Control Module (ECM) power relay sense circuit is reading a voltage that is too low, signaling a potential issue with the relay or its connections.

2. What are the common symptoms of code P0689 in a 2016 GMC Sierra?

Common symptoms include difficulty starting the engine, intermittent stalling, reduced engine performance, and illuminated check engine light.

3. What causes the P0689 code in a 2016 GMC Sierra?

Common causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a weak battery, or a malfunctioning ECM.

4. Can a bad battery cause the P0689 code on a 2016 GMC Sierra?

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

5. How do you diagnose code P0689 on a 2016 GMC Sierra?

Diagnosis involves checking the battery voltage, inspecting the ECM power relay, testing the relay circuit wiring, and verifying proper operation of the ECM.

6. Is it safe to drive a 2016 GMC Sierra with code P0689?

Itâ€™s not recommended to drive with this code, as it can lead to stalling or starting issues, potentially leaving you stranded.

7. How can you fix the P0689 code on a 2016 GMC Sierra?

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

8. Can a faulty ECM trigger code P0689 on a 2016 GMC Sierra?

Yes, a malfunctioning ECM can fail to properly sense the relay voltage, causing the P0689 code to set.

9. How much does it cost to fix code P0689 on a 2016 GMC Sierra?

Repair costs vary but typically range from $50 to $200 for a power relay replacement, with additional labor costs if wiring repairs or ECM replacement is needed.

10. Can clearing the P0689 code fix the issue on a 2016 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but it wonâ€™t resolve the underlying problem causing the code. Proper diagnosis and repair are necessary.