AutoCodes – GMC – P11FF 2015 GMC Sierra

P11FF 2015 GMC Sierra Code - Fuel Pump Command 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 Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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: P11FF 2015 GMC Sierra indicates Fuel Pump Command Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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 268

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 26, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11FF 2015 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 Fuel Pump Command Signal Message Counter is Incorrect.

OBDII Code P11FF 2015 GMC Sierra - Fuel Pump Command Signal Message Counter Incorrect - AutoCodes.com — P11FF 2015 GMC Sierra Code - Fuel Pump Command Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P11FF 2015 GMC Sierra?

Faulty Fuel Pump
Fuel Pump harness is open or shorted
Fuel Pump circuit poor electrical connection

How to Fix the DTC P11FF 2015 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 P11FF 2015 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 P11FF 2015 GMC Sierra code?

Need more information on how to fix the P11FF 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 P11FF 2015 GMC Sierra Code

1. What does the OBDII code P11FF mean on a 2015 GMC Sierra?

P11FF indicates that the fuel pump command signal message counter is incorrect, suggesting an issue with the communication between the fuel pump control module and the engine control module (ECM).

2. What are common symptoms of the P11FF code on a 2015 GMC Sierra?

Common symptoms include difficulty starting the engine, reduced engine performance, inconsistent fuel delivery, and the check engine light being illuminated.

3. What causes the P11FF code to appear on a 2015 GMC Sierra?

The P11FF code is typically caused by a malfunction in the fuel pump control module, wiring issues, poor electrical connections, or a software glitch in the ECM or fuel pump module.

4. Can a faulty fuel pump cause the P11FF code on a 2015 GMC Sierra?

While the fuel pump itself is not usually the direct cause, issues with the fuel pump control module or its communication with the ECM can trigger this code.

5. How serious is the P11FF code on a 2015 GMC Sierra?

The P11FF code is moderately serious as it can lead to poor engine performance and starting issues. It should be addressed promptly to avoid further complications.

6. What tools are needed to diagnose the P11FF code on a 2015 GMC Sierra?

A professional OBDII scanner capable of reading manufacturer-specific codes and monitoring live data is required to diagnose the P11FF code accurately.

7. What are the steps to fix the P11FF code on a 2015 GMC Sierra?

Steps include checking for loose or damaged wiring, inspecting the fuel pump control module, updating the ECM software if needed, and replacing faulty components.

8. Can the P11FF code clear itself on a 2015 GMC Sierra?

In rare cases, if the issue is intermittent (e.g., a temporary wiring fault), the code may clear itself after several drive cycles. However, proper diagnosis and repair are recommended.

9. Is it safe to drive with the P11FF code on a 2015 GMC Sierra?

Driving with this code may be safe in the short term, but it can lead to reduced performance and potential long-term damage. It's best to address the issue as soon as possible.

10. How much does it cost to fix the P11FF code on a 2015 GMC Sierra?

Repair costs vary depending on the root cause. Replacing a fuel pump control module can cost $300-$700, while wiring repairs or software updates may be less expensive.