AutoCodes – Chevrolet – P0687 2014 Chevrolet Silverado

P0687 2014 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 2014 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 238

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 2014 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 2014 Chevrolet Silverado - Engine Control Module Power Relay Control Circuit High - AutoCodes.com — P0687 2014 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0687 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P0687 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0687 2014 Chevrolet Silverado 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 P0687 2014 Chevrolet Silverado Code

1. What does the OBDII code P0687 mean on a 2014 Chevrolet Silverado?

P0687 indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit, specifically that the circuit voltage is too high.

2. What are the common symptoms of the P0687 code?

Symptoms may include the engine not starting, stalling, a lack of power, and the Check Engine Light being illuminated.

3. What causes the P0687 code in a 2014 Chevrolet Silverado?

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

4. Can a bad ECM cause the P0687 code?

Yes, a malfunctioning ECM can result in the P0687 code if it cannot properly regulate the relay control circuit.

5. How do you diagnose a P0687 code?

Diagnosis involves checking the ECM power relay, inspecting the wiring and connectors for damage or corrosion, and testing the ECM for proper functionality.

6. Can I still drive my Silverado with a P0687 code?

Driving with a P0687 code is not recommended, as it may lead to stalling or a complete inability to start the vehicle.

7. How do you fix the P0687 code?

Repair steps may include replacing a faulty ECM power relay, repairing damaged wiring, cleaning corroded connectors, or replacing the ECM if necessary.

8. How much does it cost to fix a P0687 code?

Repair costs vary depending on the issue, ranging from $50 for a new relay to $1,000 or more if the ECM needs replacement.

9. Can a weak battery cause the P0687 code?

Yes, a weak or failing battery can cause voltage irregularities, which may trigger the P0687 code.

10. Is the P0687 code a serious issue?

Yes, the P0687 code is serious because it can prevent the engine from starting or cause it to stall while driving. Immediate attention is advised.

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