AutoCodes – GMC – P15F9 2018 GMC Sierra

P15F9 2018 GMC Sierra Code - Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect

Quick Answer

The Hybrid Powertrain Control Module is constantly sending serial data messages to the Engine Control Module (ECM) regarding the operating state of the powertrain propulsion system. Common causes include Check for Hybrid Codes. 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: P15F9 2018 GMC Sierra indicates Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect.
Common causes: Common causes include Check for Hybrid Codes.
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 150

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 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15F9 2018 GMC Sierra Description

The Hybrid Powertrain Control Module is constantly sending serial data messages to the Engine Control Module (ECM) regarding the operating state of the powertrain propulsion system. These messages are sent in a continuously repeating series of rolling counts with associated password protect samples. Each count/sample is assigned a value. The ECM uses the values, during a propulsion system mode shift, to determine when and at what RPM to idle the internal combustion engine. When the ECM determines that too many of the counts/samples contain an error value, the ECM sets DTC P15F9.

OBDII Code P15F9 2018 GMC Sierra - Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect - AutoCodes.com — P15F9 2018 GMC Sierra Code - Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P15F9 2018 GMC Sierra?

Check for Hybrid Codes

How to Fix the DTC P15F9 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 P15F9 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 P15F9 2018 GMC Sierra code?

Need more information on how to fix the P15F9 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P15F9 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 P15F9 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P15F9 in a 2018 GMC Sierra Hybrid/EV system?

- Common symptoms include loss of power, decreased fuel efficiency, engine misfires, and the illumination of the check engine light.

2. What causes the OBDII code P15F9 to trigger in a 2018 GMC Sierra Hybrid/EV system?

- This code is typically triggered by an incorrect signal message counter related to the engine speed control intervention request type in the Hybrid/EV system.

3. How can I diagnose the OBDII code P15F9 in my 2018 GMC Sierra Hybrid/EV system?

- Diagnosis involves using a compatible OBDII scanner to retrieve the code, checking for any related symptoms, and inspecting the Hybrid/EV system components for any visible issues.

4. Is it safe to drive my 2018 GMC Sierra with the OBDII code P15F9 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potential damage to the Hybrid/EV system components.

5. What are some possible repair tips for addressing OBDII code P15F9 in a 2018 GMC Sierra Hybrid/EV system?

- Repair tips may include resetting the code, checking and repairing any wiring or connection issues in the Hybrid/EV system, and ensuring all related components are functioning properly.

6. Can I reset the OBDII code P15F9 in my 2018 GMC Sierra Hybrid/EV system myself?

- You can attempt to reset the code using an OBDII scanner, but it is important to diagnose and address the underlying issue causing the code to prevent it from reoccurring.

7. Are there any recalls or technical service bulletins related to OBDII code P15F9 in the 2018 GMC Sierra Hybrid/EV system?

- It is recommended to check with a GMC dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code in your vehicle.

8. How much does it typically cost to repair OBDII code P15F9 in a 2018 GMC Sierra Hybrid/EV system?

- The cost of repairs can vary depending on the underlying issue causing the code, the parts needed for repair, and the labor rates of the repair shop. It is best to get a diagnosis and estimate from a qualified mechanic.

9. Will OBDII code P15F9 in a 2018 GMC Sierra Hybrid/EV system affect the vehicle's emissions?

- Yes, this code can affect the emissions output of the vehicle due to potential issues with the engine speed control intervention request type signal message counter.

10. How can I prevent OBDII code P15F9 from occurring in my 2018 GMC Sierra Hybrid/EV system in the future?

- Regular maintenance, timely repairs of any related issues, and ensuring the Hybrid/EV system components are functioning correctly can help prevent the recurrence of this code.