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Engine-Codes – GMC – P11FF 2016 GMC Sierra

P11FF 2016 GMC Sierra Code - Fuel Pump Command Signal Message Counter Incorrect

Quick Answer

The P11FF diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Fuel Pump Command Signal Message Counter is incorrect. Common causes include Faulty wiring or connectors between the fuel pump control module and the engine control module, Malfunctioning fuel pump control module, Issues with the engine control module. 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 wiring or connectors between the fuel pump control module and the engine control module, Malfunctioning fuel pump control module, Issues with the engine control module.
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 15, 2024
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Code P11FF 2016 GMC Sierra Description

The P11FF diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Fuel Pump Command Signal Message Counter is incorrect. This code is typically associated with a communication error between the fuel pump control module and the engine control module. The fuel pump command signal message counter is used to monitor the number of messages sent between these modules, and when the counter does not match the expected value, the code is triggered.

OBDII Code P11FF 2016 GMC Sierra - Fuel Pump Command Signal Message Counter Incorrect
P11FF 2016 GMC Sierra Code - Fuel Pump Command Signal Message Counter Incorrect

Common Causes of P11FF 2016 GMC Sierra

  1. Faulty wiring or connectors between the fuel pump control module and the engine control module.
  2. Malfunctioning fuel pump control module.
  3. Issues with the engine control module.
  4. Corrosion or damage to electrical connections.
  5. Software issues causing communication errors.

Symptoms of P11FF 2016 GMC Sierra

  1. Engine misfires or hesitation during acceleration.
  2. Reduced fuel efficiency.
  3. Difficulty starting the vehicle.
  4. Stalling or rough idling.
  5. Illumination of the check engine light.

How to Fix P11FF 2016 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and identify the specific cause of the communication error.
  2. Inspect the wiring and connectors between the fuel pump control module and the engine control module for any damage or corrosion. Repair or replace as needed.
  3. Test the fuel pump control module and engine control module for proper functionality. Replace any faulty modules.
  4. Clear the trouble codes from the vehicle's computer and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be necessary to pinpoint the exact cause of the communication error.

Cost to Fix P11FF 2016 GMC Sierra

The cost of repairing a P11FF code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair could range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $200 and $800. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is recommended to obtain quotes from local shops for a more accurate estimate.

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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, it’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.

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