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P16E8 2015 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Quick Answer

The P16E8 diagnostic trouble code (DTC) for a 2015 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 shorts in the ignition circuit, ECM software or programming issues. 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 2015 GMC Sierra indicates Engine Controls Ignition Relay Signal Message Counter Incorrect.
Common causes
Common causes include Faulty ignition relay, Wiring issues or shorts in the ignition circuit, ECM software or programming issues.
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 10, 2024
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Code P16E8 2015 GMC Sierra Description

The P16E8 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is an issue with the Engine Controls Ignition Relay Signal Message Counter being incorrect. In simpler terms, this means that the vehicle's engine control module (ECM) is not receiving the correct number of signals from the ignition relay, which can lead to various performance and operational issues.

OBDII Code P16E8 2015 GMC Sierra - Engine Controls Ignition Relay Signal Message Counter Incorrect
P16E8 2015 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

Common Causes of P16E8 2015 GMC Sierra

  1. Faulty ignition relay
  2. Wiring issues or shorts in the ignition circuit
  3. ECM software or programming issues
  4. Loose or corroded electrical connections
  5. Engine control module (ECM) failure

Symptoms of P16E8 2015 GMC Sierra

  1. Rough idling
  2. Stalling
  3. Poor acceleration
  4. Difficulty starting the engine
  5. Engine misfires

How to Fix P16E8 2015 GMC Sierra

  1. Diagnose the issue: Use a diagnostic scanner to read the DTC and determine the exact cause of the incorrect signal counter. Check the ignition relay, wiring, and ECM for any faults.
  2. Replace the ignition relay: If the relay is found to be faulty, replace it with a new one to ensure proper electrical flow to the ignition system.
  3. Repair wiring or connections: Check for any damaged or corroded wiring in the ignition circuit and repair or replace as necessary. Ensure all connections are secure.
  4. Update ECM software: If the issue is related to ECM software or programming, update the software to the latest version to resolve any communication errors.
  5. Clear DTCs and test drive: After completing the repairs, clear the DTCs from the ECM memory and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P16E8 2015 GMC Sierra

The cost of repairing a P16E8 DTC on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of replacing an ignition relay can range from $50 to $150, while diagnosing and repairing wiring issues or ECM programming can cost upwards of $200 to $500. Overall, the total repair cost for this issue can range from $200 to $700, including parts and labor. It's important to note that labor rates can vary significantly based on location, with rates typically ranging from $80 to $150 per hour. It's recommended to consult with a trusted mechanic or repair shop for a more accurate cost estimate based on your vehicle's specific needs.

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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 2015 GMC Sierra Code

1. What does the OBDII code P16E8 mean on a 2015 GMC Sierra?

The P16E8 code indicates an issue with the Engine Controls Ignition Relay Signal Message Counter being incorrect, which usually points to a communication error between the ignition relay and the engine control module (ECM).

2. What are the common symptoms of the P16E8 code on a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine, intermittent stalling, reduced engine performance, or the check engine light being illuminated.

3. What causes the P16E8 code to appear on a 2015 GMC Sierra?

Common causes include a malfunctioning ignition relay, wiring or connector issues, ECM software glitches, or a failing engine control module.

4. Can a bad ignition relay cause the P16E8 code?

Yes, a faulty ignition relay can cause the P16E8 code, as it may result in incorrect signal messages being sent to the ECM.

5. How is the P16E8 code diagnosed on a 2015 GMC Sierra?

Diagnosis typically involves inspecting the ignition relay, checking the wiring and connectors for damage or corrosion, and using a scan tool to monitor communication between the ignition relay and ECM.

6. Is the P16E8 code on a 2015 GMC Sierra safe to ignore?

No, ignoring this code can lead to further issues such as engine stalling or failure to start, which could leave the vehicle inoperable.

7. How can the P16E8 code be fixed on a 2015 GMC Sierra?

Repairs may include replacing the ignition relay, repairing damaged wiring or connectors, updating the ECM software, or, in rare cases, replacing the ECM.

8. Can a software update fix the P16E8 code on a 2015 GMC Sierra?

Yes, if the issue is caused by a software glitch in the ECM, updating the ECM software may resolve the problem.

9. How much does it cost to repair the P16E8 code on a 2015 GMC Sierra?

Costs can vary, but replacing an ignition relay typically costs $50–$150, while ECM repairs or updates can range from $100 to $500 depending on the issue.

10. Can clearing the P16E8 code fix the problem on a 2015 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but it will not fix the underlying issue. Proper diagnosis and repair are necessary to resolve the problem.

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