AutoCodes – GMC – P11FF 2016 GMC Sierra

P11FF 2016 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 2016 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 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)

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 2016 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 2016 GMC Sierra - Fuel Pump Command Signal Message Counter Incorrect - AutoCodes.com — P11FF 2016 GMC Sierra Code - Fuel Pump Command Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P11FF 2016 GMC Sierra?

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

How to Fix the DTC P11FF 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P11FF 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P11FF mean on a 2016 GMC Sierra?

The P11FF code indicates that the fuel pump control module has detected an incorrect message counter for the fuel pump command signal.

2. What are the common symptoms of the P11FF code?

Symptoms may include an illuminated check engine light, difficulty starting the engine, reduced fuel efficiency, or poor engine performance.

3. What causes the P11FF code to appear?

Possible causes include a faulty fuel pump control module, wiring issues, poor electrical connections, or a malfunctioning ECM (Engine Control Module).

4. Can I drive my 2016 GMC Sierra with the P11FF code?

While it may be possible to drive, itâ€™s not recommended as the issue can lead to further engine performance problems or potential damage if left unresolved.

5. How can I diagnose the P11FF code?

Diagnosis involves checking for wiring issues, testing the fuel pump control module, verifying signal integrity, and inspecting the ECM for potential faults.

6. What should I check first when troubleshooting the P11FF code?

Start by inspecting the wiring and connectors between the fuel pump control module and the ECM for damage, corrosion, or loose connections.

7. How do I fix the P11FF code on my 2016 GMC Sierra?

Repairs may include replacing the fuel pump control module, repairing damaged wiring, or updating/reprogramming the ECM if necessary.

8. How much does it cost to fix the P11FF code?

Repair costs vary but may range from $100 to $500, depending on whether the issue is wiring-related or if the fuel pump control module needs replacement.

9. Can a software update resolve the P11FF code?

In some cases, a software update or reprogramming of the ECM can resolve the code if the issue is related to incorrect message counter calculations.

10. Do I need a professional mechanic to fix the P11FF code?

While experienced DIYers can handle basic wiring checks, diagnosing and repairing fuel pump control module or ECM issues typically requires a professional mechanic with specialized tools.