AutoCodes – GMC – P0687 2017 GMC Sierra

P0687 2017 GMC Sierra Code - Engine Control Module Power Relay Control Circuit High

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: P0687 2017 GMC Sierra indicates Engine Control Module Power Relay Control Circuit High.
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 189

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 P0687 2017 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 P0687 2017 GMC Sierra - Engine Control Module Power Relay Control Circuit High - AutoCodes.com — P0687 2017 GMC Sierra Code - Engine Control Module Power Relay Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0687 2017 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 P0687 2017 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 P0687 2017 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 P0687 2017 GMC Sierra code?

Need more information on how to fix the P0687 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0687 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P0687 in a 2017 GMC Sierra?

The common symptoms of code P0687 include engine stalling, rough idling, difficulty starting the vehicle, and a noticeable decrease in overall engine performance.

2. What causes the OBDII code P0687 in a 2017 GMC Sierra?

The most common cause of code P0687 in a 2017 GMC Sierra is a malfunctioning engine control module power relay or a problem in the control circuit that regulates its operation.

3. How serious is the OBDII code P0687 in a 2017 GMC Sierra?

Code P0687 can be a serious issue as it directly affects the power supply to the engine control module, which can lead to various performance issues and potential engine failures if left unresolved.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P0687?

It is not recommended to continue driving your vehicle with code P0687 as it can lead to further damage to the engine control module and other components. It's best to address the issue promptly.

5. How can I diagnose OBDII code P0687 in my 2017 GMC Sierra?

Diagnosing code P0687 involves using a diagnostic scanner to retrieve the trouble codes, inspecting the engine control module power relay, and testing the control circuit for any faults or abnormalities.

6. Is it possible to repair OBDII code P0687 in a 2017 GMC Sierra myself?

While some DIY enthusiasts may attempt to repair code P0687 themselves, it is recommended to seek professional help due to the complexity of diagnosing and repairing issues related to the engine control module power relay.

7. What are some tips for repairing OBDII code P0687 in a 2017 GMC Sierra?

Tips for repairing code P0687 include checking and replacing the engine control module power relay, inspecting the control circuit for any loose connections or damaged wiring, and resetting the trouble codes after repairs are completed.

8. How much does it typically cost to repair OBDII code P0687 in a 2017 GMC Sierra?

The cost of repairing code P0687 can vary depending on the extent of the issue and the labor rates of the repair shop. It's best to get a diagnostic assessment to determine the exact cost of repairs.

9. Can a faulty battery or alternator cause OBDII code P0687 in a 2017 GMC Sierra?

While a faulty battery or alternator can indirectly affect the power supply to the engine control module, they are not typically direct causes of code P0687. It's important to diagnose the specific issue accurately.

10. Can OBDII code P0687 in a 2017 GMC Sierra be a recurring problem?

If the underlying issue causing code P0687 is not properly addressed during repairs, it can potentially become a recurring problem. It's crucial to ensure all related components are thoroughly inspected and repaired to prevent recurrence.