Engine-Codes.com
Engine-Codes – GMC – P0687 2014 GMC Sierra

P0687 2014 GMC Sierra Code - Engine Control Module Power Relay Control Circuit High

Quick Answer

The P0687 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a problem with the engine control module (ECM) power relay control circuit being too high. Common causes include Faulty wiring or connections in the power relay control circuit, Malfunctioning power relay, Damaged ECM. 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 GMC Sierra indicates Engine Control Module Power Relay Control Circuit High.
Common causes
Common causes include Faulty wiring or connections in the power relay control circuit, Malfunctioning power relay, Damaged ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0687 2014 GMC Sierra Description

The P0687 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a problem with the engine control module (ECM) power relay control circuit being too high. The ECM power relay is responsible for providing power to the ECM, which is the brain of the vehicle's engine management system. The ECM controls various functions such as fuel injection, ignition timing, and emissions systems. When the power relay control circuit is too high, it means that there is an issue with the voltage being supplied to the ECM, which can lead to improper engine performance and potentially cause long-term damage if not addressed promptly.

OBDII Code P0687 2014 GMC Sierra - Engine Control Module Power Relay Control Circuit High
P0687 2014 GMC Sierra Code - Engine Control Module Power Relay Control Circuit High

Common Causes of P0687 2014 GMC Sierra

  1. Faulty wiring or connections in the power relay control circuit
  2. Malfunctioning power relay
  3. Damaged ECM
  4. Issues with the vehicle's battery or charging system

Symptoms of P0687 2014 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Stalling
  4. Decreased fuel efficiency
  5. Limp mode activation

How to Fix P0687 2014 GMC Sierra

  1. Begin by checking the wiring and connections in the power relay control circuit for any damage or corrosion. Repair or replace any faulty components.
  2. Test the power relay to ensure it is functioning correctly. Replace the relay if necessary.
  3. Check the ECM for any signs of damage or malfunction. If the ECM is faulty, it will need to be replaced.
  4. Inspect the vehicle's battery and charging system to ensure they are providing the correct voltage to the ECM. Address any issues with the battery or charging system as needed.

Cost to Fix P0687 2014 GMC Sierra

The typical repair costs for addressing a P0687 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a power relay or ECM can range from $100 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $200 and $800. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.

Need more information about the P0687 2014 GMC Sierra code?

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

Need Help with the Code?

Get the P0687 2014 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 P0687 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P0687 in a 2014 GMC Sierra?

- Common symptoms include engine stalling, rough idle, difficulty starting the vehicle, and potential loss of power.

2. What does the OBDII code P0687 for a 2014 GMC Sierra indicate?

- The code P0687 indicates a problem with the Engine Control Module (ECM) power relay control circuit being too high.

3. What are the possible causes of OBDII code P0687 in a 2014 GMC Sierra?

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

4. How can I diagnose the OBDII code P0687 in my 2014 GMC Sierra?

- Diagnosing the code involves checking the ECM power relay, inspecting the wiring and connectors for damage, and testing the ECM for proper function.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P0687?

- It is not recommended to continue driving with the code present, as it can lead to further engine performance issues and potential damage if left unresolved.

6. How can I repair OBDII code P0687 in my 2014 GMC Sierra?

- Repairing the code typically involves replacing the faulty ECM power relay, repairing any damaged wiring or connectors, and resetting the code with a diagnostic tool.

7. Is it possible to reset the OBDII code P0687 in a 2014 GMC Sierra without fixing the underlying issue?

- While you can reset the code temporarily, it is important to address the underlying issue to prevent further problems and potential damage to the vehicle.

8. How much does it cost to repair OBDII code P0687 in a 2014 GMC Sierra?

- The cost of repair can vary depending on the extent of the issue, but it typically involves the cost of a new ECM power relay and any labor charges for installation.

9. Can a DIY enthusiast fix OBDII code P0687 in a 2014 GMC Sierra?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to replace the ECM power relay or check for damaged wiring, but more complex issues may require professional assistance.

10. Will OBDII code P0687 cause my 2014 GMC Sierra to fail an emissions test?

- Yes, the presence of code P0687 can cause your vehicle to fail an emissions test due to its impact on engine performance and emissions control systems.

Discuss the causes and fixes for P0687 2014 GMC Sierra OBDII Code

Submit a New Comment

Code P0687 2014 GMC Sierra comments

No comments found for this page.