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P16E8 2017 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Quick Answer

The P16E8 diagnostic trouble code for a 2017 GMC Sierra indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect. Common causes include Faulty ignition relay, Wiring or connection issues between the ignition relay and ECM, ECM software or hardware 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 2017 GMC Sierra indicates Engine Controls Ignition Relay Signal Message Counter Incorrect.
Common causes
Common causes include Faulty ignition relay, Wiring or connection issues between the ignition relay and ECM, ECM software or hardware 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 Aug 19, 2024
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Code P16E8 2017 GMC Sierra Description

The P16E8 diagnostic trouble code for a 2017 GMC Sierra indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect. This means that the signal being sent by the ignition relay is not being received or processed correctly by the engine control module (ECM). The ignition relay is responsible for sending power to the ignition system, which is crucial for starting the engine and maintaining proper operation. When the ECM does not receive the correct signal from the ignition relay, it can lead to various performance issues and potentially cause the vehicle to stall or not start at all.

OBDII Code P16E8 2017 GMC Sierra - Engine Controls Ignition Relay Signal Message Counter Incorrect
P16E8 2017 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Common Causes of P16E8 2017 GMC Sierra

  1. Faulty ignition relay
  2. Wiring or connection issues between the ignition relay and ECM
  3. ECM software or hardware malfunction
  4. Electrical system problems
  5. Environmental factors such as moisture or corrosion affecting connections

Symptoms of P16E8 2017 GMC Sierra

  1. Engine stalling or difficulty starting
  2. Loss of power while driving
  3. Illumination of the check engine light
  4. Rough idling or misfiring
  5. Reduced fuel efficiency

How to Fix P16E8 2017 GMC Sierra

  1. Diagnose the issue with a professional scan tool to confirm the code and pinpoint the exact cause.
  2. Inspect the ignition relay and its connections for any signs of damage or corrosion.
  3. Test the wiring between the relay and ECM for continuity and proper voltage.
  4. Replace the faulty ignition relay if necessary and ensure proper installation.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P16E8 2017 GMC Sierra

The cost estimate for repairing a P16E8 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. However, on average, the repair costs for this type of problem can range from $100 to $300, including parts and labor. It's important to note that diagnostic time and labor rates can vary depending on the location, shop rates, and other factors. It's recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your specific circumstances.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P16E8 in a 2017 GMC Sierra?

The common symptoms of code P16E8 include engine misfires, rough idling, poor acceleration, and the Check Engine light being illuminated.

2. What does the OBDII code P16E8 indicate in a 2017 GMC Sierra?

Code P16E8 indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect, suggesting a communication issue between the engine controls and ignition relay.

3. What are the possible causes of OBDII code P16E8 in a 2017 GMC Sierra?

Possible causes of code P16E8 include a faulty ignition relay, wiring or connection issues, a malfunctioning engine control module (ECM), or a software glitch.

4. How can I diagnose the OBDII code P16E8 in my 2017 GMC Sierra?

Diagnosing code P16E8 involves checking the ignition relay, inspecting the wiring for damage or loose connections, scanning the ECM for other related codes, and performing a communication test between the components.

5. Can I continue driving my 2017 GMC Sierra with OBDII code P16E8?

It is not recommended to continue driving your vehicle with code P16E8 present, as it can lead to potential engine performance issues and further damage if left unresolved.

6. How can I repair OBDII code P16E8 in my 2017 GMC Sierra?

Repairing code P16E8 may involve replacing the faulty ignition relay, repairing any damaged wiring, resetting the ECM, or updating the software to address communication errors.

7. Is it necessary to reset the OBDII code P16E8 after repairs in a 2017 GMC Sierra?

Yes, it is important to reset the code after making repairs to clear the fault from the system and ensure that the issue has been resolved successfully.

8. Can a DIY enthusiast fix OBDII code P16E8 in a 2017 GMC Sierra?

While some simple checks like inspecting wiring connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to code P16E8 may require professional assistance.

9. How much does it cost to repair OBDII code P16E8 in a 2017 GMC Sierra?

The cost of repairing code P16E8 can vary depending on the exact cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is best to consult a mechanic for an accurate estimate.

10. Will OBDII code P16E8 affect the overall performance of my 2017 GMC Sierra?

Yes, code P16E8 can affect the overall performance of your vehicle by causing engine misfires, rough idling, and poor acceleration if not addressed promptly.

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