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P16E8 2014 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Quick Answer

The P16E8 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Engine Controls Ignition Relay Signal Message Counter being incorrect. Common causes include Faulty ignition relay, Wiring issues or loose connections, ECM malfunction. 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
P16E8 2014 GMC Sierra indicates Engine Controls Ignition Relay Signal Message Counter Incorrect.
Common causes
Common causes include Faulty ignition relay, Wiring issues or loose connections, ECM malfunction.
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 16, 2024
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Code P16E8 2014 GMC Sierra Description

The P16E8 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Engine Controls Ignition Relay Signal Message Counter being incorrect. This code typically points to a problem with the communication between the engine control module (ECM) and the ignition relay. The ignition relay is responsible for sending the signal to the ignition system to start the engine. When the message counter is incorrect, it means that the ECM is not receiving the correct number of signals from the ignition relay, which can lead to starting issues and potential engine performance problems.

OBDII Code P16E8 2014 GMC Sierra - Engine Controls Ignition Relay Signal Message Counter Incorrect
P16E8 2014 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Common Causes of P16E8 2014 GMC Sierra

  1. Faulty ignition relay
  2. Wiring issues or loose connections
  3. ECM malfunction
  4. Communication error between ECM and ignition relay
  5. Electrical system issues

Symptoms of P16E8 2014 GMC Sierra

  1. Difficulty starting the engine
  2. Rough idling or misfiring
  3. Engine stalling
  4. Reduced engine performance
  5. Check engine light illuminated

How to Fix P16E8 2014 GMC Sierra

  1. Perform a thorough inspection of the ignition relay and wiring connections to check for any visible damage or loose connections.
  2. Test the ignition relay using a multimeter to determine if it is functioning correctly.
  3. Check the ECM for any signs of damage or malfunction and perform diagnostic tests to verify its operation.
  4. Reset the ECM and clear the DTC to see if the issue persists after resetting the system.
  5. If necessary, replace the faulty ignition relay, repair any damaged wiring, or replace the ECM to resolve the incorrect message counter issue.

Cost to Fix P16E8 2014 GMC Sierra

The typical repair costs for addressing the P16E8 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty ignition relay can range from $100 to $300, while repairing wiring issues or replacing the ECM can cost between $200 and $800. Labor costs at auto repair shops can range from $80 to $150 per hour, and the total repair bill may also include diagnostic fees and additional parts if needed. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the vehicle.

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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 P16E8 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P16E8 in a 2014 GMC Sierra?

The common symptoms include engine misfires, rough idling, poor acceleration, and potential stalling of the vehicle.

2. What does the OBDII code P16E8 "Engine Controls Ignition Relay Signal Message Counter Incorrect" mean for a 2014 GMC Sierra?

This code indicates that the engine control module (ECM) has detected an incorrect signal or count from the ignition relay circuit.

3. What are the possible causes of OBDII code P16E8 in a 2014 GMC Sierra?

Possible causes include a faulty ignition relay, wiring issues in the ignition relay circuit, a malfunctioning ECM, or software glitches within the vehicle's control modules.

4. How can I diagnose the OBDII code P16E8 in a 2014 GMC Sierra?

Diagnosis typically involves inspecting the ignition relay and its circuit for any visible damage, testing the relay's functionality, checking for loose or corroded wiring connections, and using a diagnostic scanner to gather more data.

5. Can I continue driving my 2014 GMC Sierra with the OBDII code P16E8 present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further engine issues and potential safety hazards. It's best to address the problem promptly.

6. How can I repair OBDII code P16E8 in a 2014 GMC Sierra?

Repair options may include replacing the faulty ignition relay, repairing any damaged wiring, resetting the ECM, or updating the vehicle's software to address any glitches causing the issue.

7. Will resetting the ECM clear the OBDII code P16E8 from a 2014 GMC Sierra?

Resetting the ECM may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It's essential to diagnose and fix the root cause of the problem.

8. Is it safe to reset the ECM to clear the OBDII code P16E8 in a 2014 GMC Sierra?

Resetting the ECM is generally safe and a common troubleshooting step. However, ensure you have diagnosed the issue correctly and that any necessary repairs are made to prevent the code from reappearing.

9. Can a DIY enthusiast repair OBDII code P16E8 in a 2014 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing complex issues related to this code may require professional tools and expertise. It's recommended to seek assistance if needed.

10. How much does it typically cost to repair OBDII code P16E8 in a 2014 GMC Sierra?

The cost of repairs can vary depending on the underlying cause of the issue, the parts needed for replacement, and labor charges. It's advisable to obtain quotes from reputable mechanics or service centers for an accurate estimate.

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