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P0687 2017 Chevrolet Silverado 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 Chevrolet Silverado 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 237
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Jul 19, 2022
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Code P0687 2017 Chevrolet Silverado 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 Chevrolet Silverado - Engine Control Module Power Relay Control Circuit High - AutoCodes.com
P0687 2017 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit High
What does this mean?

What are the Possible Causes of the DTC P0687 2017 Chevrolet Silverado?

  • 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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P0687 2017 Chevrolet Silverado 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 Chevrolet Silverado Code

What does the OBDII code P0687 mean on a 2017 Chevrolet Silverado?

The P0687 code indicates an issue with the Engine Control Module (ECM) power relay control circuit, specifically a high voltage condition.

What are the common symptoms of P0687 in a 2017 Chevrolet Silverado?

Symptoms may include difficulty starting the engine, poor engine performance, the engine stalling, or the Check Engine Light illuminating.

What causes the P0687 code to appear on a 2017 Chevrolet Silverado?

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

Can I drive my 2017 Chevrolet Silverado with the P0687 code?

It’s not recommended, as the issue could cause intermittent stalling or lead to further damage to the ECM or electrical system.

How do I diagnose the P0687 code in a 2017 Chevrolet Silverado?

Diagnosis involves checking the ECM power relay, inspecting the wiring and connectors for damage, and testing the voltage and ground signals in the circuit.

How do I fix the P0687 code on my 2017 Chevrolet Silverado?

Repairs might include replacing the faulty ECM power relay, repairing or replacing damaged wiring or connectors, or, in rare cases, replacing the ECM.

What tools are needed to diagnose and repair the P0687 code?

You’ll typically need a digital multimeter, an OBDII scanner, and possibly wiring diagrams for the ECM power relay circuit.

Could a dead battery cause the P0687 code on a 2017 Chevrolet Silverado?

A dead or weak battery could contribute to voltage issues but is unlikely to be the sole cause of this specific code.

How much does it cost to fix the P0687 code in a 2017 Chevrolet Silverado?

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

Is the P0687 code related to other codes on a 2017 Chevrolet Silverado?

Yes, it can be related to other electrical or powertrain codes, particularly those involving the ECM or relay circuits.

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