AutoCodes – GMC – P16E8 2018 GMC Sierra

P16E8 2018 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 2018 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 134

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P16E8 2018 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 2018 GMC Sierra - Engine Controls Ignition Relay Signal Message Counter Incorrect - AutoCodes.com — P16E8 2018 GMC Sierra Code - Engine Controls Ignition Relay Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P16E8 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the P16E8 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16E8 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P16E8 in a 2018 GMC Sierra?

- Common symptoms may include engine misfires, rough idling, stalling, and difficulty starting the vehicle.

2. What causes the OBDII code P16E8 in a 2018 GMC Sierra?

- The code P16E8 typically indicates an issue with the engine controls ignition relay signal message counter being incorrect.

3. How serious is the OBDII code P16E8 in a 2018 GMC Sierra?

- While the severity can vary, it is important to address this code promptly to prevent potential damage to the engine or other components.

4. Can I still drive my 2018 GMC Sierra with the P16E8 code present?

- It is not recommended to continue driving the vehicle with this code active, as it may lead to further issues and potential engine damage.

5. How do I diagnose the OBDII code P16E8 in my 2018 GMC Sierra?

- Proper diagnostic tools such as an OBDII scanner can help pinpoint the exact cause of the code, along with inspecting related components.

6. What are some possible DIY repair tips for resolving the P16E8 code in a 2018 GMC Sierra?

- DIY repair tips may include checking and potentially replacing the ignition relay, inspecting wiring for damage, and ensuring proper connections.

7. Is it advisable to reset the OBDII code P16E8 in a 2018 GMC Sierra after making repairs?

- Yes, it is recommended to reset the code after addressing the underlying issue to see if the problem has been successfully resolved.

8. Could a faulty ignition system be a potential trigger for the P16E8 code in a 2018 GMC Sierra?

- Yes, a faulty ignition system, including components like the ignition relay or wiring, can contribute to triggering the P16E8 code.

9. Are there any recalls or technical service bulletins related to the P16E8 code in a 2018 GMC Sierra?

- It is advisable to check with the manufacturer or authorized service centers for any relevant recalls or technical service bulletins related to this code.

10. How much can I expect to pay for professional repairs related to the OBDII code P16E8 in a 2018 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue, but it is recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.