AutoCodes – GMC – P16E8 2015 GMC Sierra

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

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay circuit poor electrical connection. 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 Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay circuit poor electrical connection.
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.

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Code Popularity 143

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16E8 2015 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Engine Controls Ignition Relay Signal Message Counter Incorrect.

OBDII Code P16E8 2015 GMC Sierra - Engine Controls Ignition Relay Signal Message Counter Incorrect - AutoCodes.com — P16E8 2015 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P16E8 2015 GMC Sierra?

Faulty Engine Controls Ignition Relay
Engine Controls Ignition Relay harness is open or shorted
Engine Controls Ignition Relay circuit poor electrical connection

How to Fix the DTC P16E8 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16E8 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P16E8 2015 GMC Sierra code?

Need more information on how to fix the P16E8 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 $50â€“$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.