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P11FF Chevrolet Code - Fuel Pump Command Signal Message Counter Incorrect

Quick Answer

The P11FF code for Chevrolet vehicles indicates that the Fuel Pump Command Signal Message Counter is incorrect. Common causes include Faulty fuel pump, Wiring or connection issues between the fuel pump and ECM, ECM malfunction. 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 Chevrolet indicates Fuel Pump Command Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel pump, Wiring or connection issues between the fuel pump and ECM, ECM malfunction.
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 Aug 19, 2024
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Code P11FF Chevrolet Description

The P11FF code for Chevrolet vehicles indicates that the Fuel Pump Command Signal Message Counter is incorrect. This means that the signal sent to the fuel pump to regulate fuel flow and pressure is not being received or processed correctly by the vehicle's computer system. This can lead to issues with fuel delivery, which can impact engine performance and efficiency.

OBDII Code P11FF Chevrolet - Fuel Pump Command Signal Message Counter Incorrect
P11FF Chevrolet Code - Fuel Pump Command Signal Message Counter Incorrect

Common Causes of P11FF Chevrolet

  1. Faulty fuel pump.
  2. Wiring or connection issues between the fuel pump and ECM.
  3. ECM malfunction.
  4. Fuel pressure sensor failure.
  5. Electrical issues such as a blown fuse or relay related to the fuel pump.

Symptoms of P11FF Chevrolet

  1. Engine stalling or hesitation during acceleration.
  2. Rough idling or misfiring.
  3. Reduced fuel efficiency.
  4. Difficulty starting the engine.
  5. Illumination of the check engine light.

How to Fix P11FF Chevrolet

  1. Diagnose the issue using a scan tool to verify the P11FF code and identify the root cause.
  2. Inspect the wiring and connections between the fuel pump and ECM for any damage or corrosion.
  3. Test the fuel pump and fuel pressure sensor for proper operation.
  4. Replace any faulty components such as the fuel pump, pressure sensor, or ECM as needed.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P11FF Chevrolet

The cost of repairing a P11FF code on a Chevrolet vehicle can vary depending on the specific cause of the issue and the cost of parts and labor in your area. On average, the repair cost can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates can vary, so it's recommended to obtain quotes from multiple auto repair shops to get an accurate estimate.

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Information for Specific Chevrolet Models

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 Chevrolet Code

1. What does the OBDII code P11FF mean on a Chevrolet?

P11FF indicates an issue with the fuel pump command signal message counter, where the signal from the fuel pump control module is not being received or processed correctly by the engine control module (ECM).

2. What are the common symptoms of code P11FF in a Chevrolet?

Symptoms may include difficulty starting the vehicle, reduced engine performance, stalling, or the illumination of the check engine light.

3. What causes code P11FF on a Chevrolet?

The most common causes are a malfunctioning fuel pump control module, wiring or connection issues between the control module and ECM, or a software issue in the ECM.

4. Can a bad fuel pump cause the P11FF code?

While the fuel pump itself is not typically the direct cause, issues with the fuel pump control module or related wiring can trigger this code.

5. How is code P11FF diagnosed on a Chevrolet?

A technician will use a scan tool to check the fuel pump command signal and inspect wiring, connectors, and the fuel pump control module for faults.

6. Can I drive my Chevrolet with code P11FF?

Driving with this code is not recommended, as it may lead to poor engine performance, stalling, or even a no-start condition.

7. How do you fix code P11FF on a Chevrolet?

Repairs may involve replacing the faulty fuel pump control module, repairing damaged wiring or connectors, or reprogramming the ECM if needed.

8. Is the P11FF code specific to Chevrolet vehicles?

While other manufacturers may use similar codes, P11FF is commonly associated with Chevrolet and GM vehicles.

9. What tools are needed to troubleshoot the P11FF code?

A professional OBDII scan tool, a multimeter for testing electrical circuits, and possibly the vehicle’s service manual are essential for diagnosing this code.

10. Will clearing the P11FF code fix the issue?

Clearing the code will temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

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