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P15E2 2018 GMC Sierra Code - Alternative Fuel System Request Signal Message Counter Incorrect

Quick Answer

The P15E2 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Alternative Fuel System Request Signal Message Counter is incorrect. Common causes include Faulty sensors within the alternative fuel system, Wiring issues affecting communication between components, Malfunctioning fuel pump or fuel pressure regulator. 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 sensors within the alternative fuel system, Wiring issues affecting communication between components, Malfunctioning fuel pump or fuel pressure regulator.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P15E2 2018 GMC Sierra Description

The P15E2 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Alternative Fuel System Request Signal Message Counter is incorrect. This code is related to the vehicle's alternative fuel system, which includes components such as the fuel injectors, fuel pump, fuel pressure regulator, and fuel lines that are responsible for delivering fuel to the engine. The message counter being incorrect suggests that there is a discrepancy in the communication between the various components of the alternative fuel system, leading to potential issues with fuel delivery and engine performance.

OBDII Code P15E2 2018 GMC Sierra - Alternative Fuel System Request Signal Message Counter Incorrect
P15E2 2018 GMC Sierra Code - Alternative Fuel System Request Signal Message Counter Incorrect

Common Causes of P15E2 2018 GMC Sierra

  1. Faulty sensors within the alternative fuel system
  2. Wiring issues affecting communication between components
  3. Malfunctioning fuel pump or fuel pressure regulator
  4. Clogged fuel injectors
  5. ECM malfunction

Symptoms of P15E2 2018 GMC Sierra

  1. Rough idling
  2. Hesitation during acceleration
  3. Decreased fuel efficiency
  4. Stalling
  5. Difficulty starting or failure to start

How to Fix P15E2 2018 GMC Sierra

  1. Perform a comprehensive diagnostic scan to retrieve the specific trouble codes and pinpoint the issue.
  2. Inspect the wiring and connectors within the alternative fuel system for any signs of damage or corrosion.
  3. Test the fuel pump and fuel pressure regulator to ensure they are functioning properly.
  4. Clean or replace clogged fuel injectors as needed.
  5. If necessary, reprogram or replace the ECM to address any communication issues within the fuel system.

Cost to Fix P15E2 2018 GMC Sierra

The typical repair costs for addressing a P15E2 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts and labor for this type of repair can range from $200 to $800. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates. For a more accurate estimate, it's recommended to consult with local auto repair shops.

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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 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 vehicle’s computer.

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

While the vehicle may still be drivable, it’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 vehicle’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 vehicle’s control modules may resolve communication issues and fix the P15E2 code.

9. Is the P15E2 code related to the vehicle’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.

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