AutoCodes – GMC – P15F8 2018 GMC Sierra

P15F8 2018 GMC Sierra Code - Automatic Braking Engine Torque Request Signal Message Counter Incorrect

Quick Answer

The Electronic Brake Control Module (EBCM) and The Engine Control Module (ECM) simultaneously control the vehicle performance. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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: P15F8 2018 GMC Sierra indicates Automatic Braking Engine Torque Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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 180

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15F8 2018 GMC Sierra Description

The Electronic Brake Control Module (EBCM) and The Engine Control Module (ECM) simultaneously control the vehicle performance. During an automatic brake event, the electronic brake control module sends a serial data message to the engine control module requesting torque reduction. If the engine control module receives corrupt data from the electronic brake control module, Diagnostic Trouble Code (DTC) P15F8 will be set in the engine control module. The engine control module then sends a serial data message to the electronic brake control module that torque reduction is not allowed. The DTC will be set when the ECM detects a corrupted data message from the electronic brake control module.

OBDII Code P15F8 2018 GMC Sierra - Automatic Braking Engine Torque Request Signal Message Counter Incorrect - AutoCodes.com — P15F8 2018 GMC Sierra Code - Automatic Braking Engine Torque Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P15F8 2018 GMC Sierra?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection

How to Fix the DTC P15F8 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 P15F8 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 P15F8 2018 GMC Sierra code?

Need more information on how to fix the P15F8 2018 GMC Sierra code? Get Access to Factory Service Manuals

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Get the P15F8 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 P15F8 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P15F8 in a 2018 GMC Sierra?

- Common symptoms include the illumination of the Check Engine Light, reduced engine performance, and potential issues with the automatic braking system.

2. What does the OBDII code P15F8 indicate in a 2018 GMC Sierra?

- The code P15F8 indicates that the Engine Control Module (ECM) has detected an incorrect signal message counter related to the automatic braking engine torque request.

3. What are the possible causes of OBDII code P15F8 in a 2018 GMC Sierra?

- Possible causes include faulty wiring or connectors in the automatic braking system, issues with the engine torque sensor, a malfunctioning ECM, or software glitches.

4. How can I diagnose OBDII code P15F8 in my 2018 GMC Sierra?

- Diagnosing this code typically involves using a diagnostic scan tool to retrieve the specific fault codes, inspecting the automatic braking system components, and checking for any loose connections.

5. Can I continue driving my 2018 GMC Sierra with the OBDII code P15F8?

- It is not recommended to drive the vehicle with this code present as it can affect the proper functioning of the automatic braking system and potentially compromise safety.

6. How can I repair OBDII code P15F8 in my 2018 GMC Sierra?

- Repairing this code may involve addressing the underlying cause, such as repairing or replacing damaged wiring, fixing issues with the engine torque sensor, or reprogramming the ECM.

7. Is it safe to clear the OBDII code P15F8 in a 2018 GMC Sierra without fixing the issue?

- Clearing the code without addressing the root cause may temporarily turn off the Check Engine Light, but the problem will likely reoccur, potentially leading to safety concerns and further issues.

8. Can a DIY enthusiast fix OBDII code P15F8 in a 2018 GMC Sierra?

- While basic troubleshooting like checking connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to this code may require professional expertise and specialized tools.

9. How much does it cost to repair OBDII code P15F8 in a 2018 GMC Sierra at a dealership?

- The cost of repairing this code at a dealership can vary depending on the specific cause of the issue, but it may involve diagnostic fees, parts replacement costs, and labor charges.

10. How often does OBDII code P15F8 occur in a 2018 GMC Sierra?

- The occurrence of this specific code can vary, but it is relatively uncommon compared to more generic OBDII codes. If you encounter this code, it is essential to address it promptly to avoid potential safety risks.