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

Quick Answer

The P16E8 GMC diagnostic trouble code indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect. Common causes include Faulty ignition relay, Wiring issues or damaged wiring harness, ECM malfunction or software glitch. 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 GMC indicates Engine Controls Ignition Relay Signal Message Counter Incorrect.
Common causes
Common causes include Faulty ignition relay, Wiring issues or damaged wiring harness, ECM malfunction or software glitch.
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 GMC Description

The P16E8 GMC diagnostic trouble code indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect. This means that the Engine Control Module (ECM) has detected an issue with the signal message counter related to the ignition relay. The ignition relay is responsible for sending the signal to the ECM to control the ignition system, which is crucial for starting and running the engine. When the signal message counter is incorrect, it can lead to issues with engine performance, starting, and overall vehicle operation.

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

Common Causes of P16E8 GMC

  1. Faulty ignition relay.
  2. Wiring issues or damaged wiring harness.
  3. ECM malfunction or software glitch.
  4. Poor connection between ignition relay and ECM.
  5. Electrical system issues such as a weak battery or alternator.

Symptoms of P16E8 GMC

  1. Hard starting or difficulty in starting the engine.
  2. Rough idling or engine misfires.
  3. Stalling or hesitation during acceleration.
  4. Engine performance issues such as decreased power or fuel efficiency.

How to Fix P16E8 GMC

  1. Begin by conducting a thorough visual inspection of the wiring harness and connectors related to the ignition relay and ECM. Look for any signs of damage, corrosion, or loose connections.
  2. Test the ignition relay using a multimeter to check for proper functionality. Replace the relay if it is found to be faulty.
  3. Perform a diagnostic scan using a professional scan tool to retrieve and clear the trouble code. Monitor the signal message counter to ensure it is within the correct range.
  4. If the issue persists, further diagnose the ECM for any malfunctions or software glitches. Consider reprogramming or replacing the ECM if necessary.
  5. Once the repair is completed, clear the trouble code and test drive the vehicle to ensure that the symptoms have been resolved.

Cost to Fix P16E8 GMC

The typical repair costs for addressing the P16E8 GMC code can vary depending on the specific cause of the issue. On average, the cost of replacing an ignition relay can range from $50 to $150, while diagnosing and repairing wiring issues or ECM malfunctions can cost between $100 to $500 or more. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and the shop's rates. It is advisable to consult with a professional mechanic to get an accurate estimate for the repair.

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Information for Specific GMC Models

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 GMC Code

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

- Common symptoms include rough idling, stalling, difficulty starting the engine, and the Check Engine light being illuminated.

2. What does the OBDII code P16E8 GMC indicate?

- The code P16E8 indicates that the Engine Controls Ignition Relay Signal Message Counter is incorrect.

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

- Possible causes include a faulty ignition relay, wiring issues, a damaged relay control circuit, or a problem with the engine control module.

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

- Diagnosing the code typically involves inspecting the ignition relay, checking the wiring for any damage, testing the relay control circuit, and scanning the engine control module for related faults.

5. Can I drive my GMC vehicle with the OBDII code P16E8 present?

- It is not recommended to drive your vehicle with the P16E8 code present, as it can lead to poor engine performance and potential further damage.

6. What are some repair tips for resolving the OBDII code P16E8 GMC?

- Repair tips may include replacing the faulty ignition relay, repairing any damaged wiring, ensuring proper connections, and clearing the trouble code with a diagnostic scanner.

7. How serious is the OBDII code P16E8 in a GMC vehicle?

- The P16E8 code should be addressed promptly to avoid potential engine performance issues and prevent further damage to the vehicle.

8. Can I reset the OBDII code P16E8 in my GMC vehicle without fixing the underlying issue?

- While you can clear the code with a diagnostic scanner, it is recommended to fix the underlying issue causing the code to prevent future problems.

9. Does the OBDII code P16E8 GMC require professional repair?

- Depending on your level of automotive experience, you may need professional assistance to diagnose and repair the underlying issue causing the P16E8 code.

10. How can I prevent the OBDII code P16E8 from recurring in my GMC vehicle?

- Regular maintenance, timely repairs of any related issues, and using high-quality parts can help prevent the recurrence of the P16E8 trouble code.

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