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P0687 Chevrolet 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 Chevrolet 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 4,058
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 18, 2022
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Code P0687 Chevrolet 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 Chevrolet - Engine Control Module Power Relay Control Circuit High - AutoCodes.com
P0687 Chevrolet Code - Engine Control Module Power Relay Control Circuit High
What does this mean?

What are the Possible Causes of the DTC P0687 Chevrolet?

  • 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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P0687 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

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 Chevrolet Code

1. What are common symptoms of OBDII code P0687 in a Chevrolet vehicle?

- Common symptoms include engine stalling, difficulty starting the engine, and illuminated Check Engine Light.

2. What does the OBDII code P0687 Chevrolet indicate?

- The code P0687 indicates a problem with the Engine Control Module Power Relay Control Circuit being high.

3. What are possible causes of OBDII code P0687 in a Chevrolet?

- Possible causes include a faulty power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning Engine Control Module.

4. How can I diagnose the OBDII code P0687 in my Chevrolet?

- Diagnosis involves checking the power relay, inspecting the wiring and connectors for damage, and testing the Engine Control Module for proper functioning.

5. How serious is the OBDII code P0687 in a Chevrolet?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent further damage and potential safety risks.

6. Can I drive my Chevrolet with the OBDII code P0687?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to engine performance issues and potential breakdowns.

7. How can I repair OBDII code P0687 in my Chevrolet?

- Repair may involve replacing the faulty power relay, repairing damaged wiring or connectors, or reprogramming the Engine Control Module.

8. Are there any DIY tips for fixing OBDII code P0687 in a Chevrolet?

- DIY tips include checking and cleaning the power relay connections, inspecting wiring for visible damage, and ensuring proper grounding in the circuit.

9. Can a faulty battery cause OBDII code P0687 in a Chevrolet?

- Yes, a weak or faulty battery can sometimes trigger this code due to insufficient power supply to the Engine Control Module.

10. How much does it typically cost to fix OBDII code P0687 in a Chevrolet?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 to $500, including parts and labor.

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