AutoCodes – GMC – P15E2 2018 GMC Sierra

P15E2 2018 GMC Sierra Code - Alternative Fuel System Request 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 Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: P15E2 2018 GMC Sierra indicates Alternative Fuel System Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 145

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 P15E2 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 Alternative Fuel System Request Signal Message Counter is Incorrect.

OBDII Code P15E2 2018 GMC Sierra - Alternative Fuel System Request Signal Message Counter Incorrect - AutoCodes.com — P15E2 2018 GMC Sierra Code - Alternative Fuel System Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P15E2 2018 GMC Sierra?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P15E2 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 P15E2 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 P15E2 2018 GMC Sierra code?

Need more information on how to fix the P15E2 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P15E2 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 P15E2 2018 GMC Sierra Code

1. What does the OBDII code P15E2 mean for a 2018 GMC Sierra?

P15E2 indicates an issue with the Alternative Fuel System Request Signal Message Counter, meaning the signal or data from the alternative fuel system is not being properly received or processed.

2. What are the common symptoms of the P15E2 code?

Symptoms may include the check engine light turning on, reduced engine performance, alternative fuel system not functioning properly, or irregular fuel switching behavior.

3. What causes the P15E2 code to appear?

Common causes include a faulty alternative fuel system control module, damaged wiring or connectors, or communication issues between the control module and the vehicleâ€™s computer.

4. Can I drive my 2018 GMC Sierra with the P15E2 code?

While the vehicle may still be drivable, itâ€™s not recommended as the alternative fuel system may not function correctly, potentially leading to increased emissions or reduced performance.

5. How is the P15E2 code diagnosed?

A mechanic will use a scan tool to check for the code and review freeze frame data, inspect the wiring and connectors related to the alternative fuel system, and test the communication signals between modules.

6. What repairs can fix the P15E2 code?

Repairs may involve replacing the alternative fuel system control module, repairing or replacing damaged wiring or connectors, or updating the vehicleâ€™s software.

7. How much does it cost to fix the P15E2 code on a 2018 GMC Sierra?

The cost depends on the specific issue but typically ranges from $200 to $600 for diagnostics and repairs, with higher costs if the control module needs replacement.

8. Can a software update resolve the P15E2 code?

In some cases, a software update to the vehicleâ€™s control modules may resolve communication issues and fix the P15E2 code.

9. Is the P15E2 code related to the vehicleâ€™s emissions system?

Yes, the alternative fuel system is part of the emissions control system, and a malfunction could impact emissions compliance.

10. How can I prevent the P15E2 code from reoccurring?

Regular maintenance, ensuring wiring and connectors are in good condition, and addressing alternative fuel system issues promptly can help prevent this code from returning.