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P11FF 2015 Chevrolet Silverado Code - Fuel Pump Command Signal Message Counter Incorrect

Quick Answer

The P11FF diagnostic trouble code (DTC) for the 2015 Chevrolet Silverado indicates an issue with the fuel pump command signal message counter. Common causes include Faulty fuel pump or fuel pump relay, Damaged wiring or corroded connectors in the fuel pump circuit, Malfunctioning fuel pump 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 2015 Chevrolet Silverado indicates Fuel Pump Command Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel pump or fuel pump relay, Damaged wiring or corroded connectors in the fuel pump circuit, Malfunctioning fuel pump 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 Oct 26, 2024
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Code P11FF 2015 Chevrolet Silverado Description

The P11FF diagnostic trouble code (DTC) for the 2015 Chevrolet Silverado indicates an issue with the fuel pump command signal message counter. This code is part of the vehicle's onboard diagnostics (OBD-II) system and is specifically related to the communication between the engine control module (ECM) and the fuel pump control module. When the ECM sends a command to the fuel pump, it expects to receive a response within a certain timeframe. If the response is delayed or incorrect, the ECM will increment a message counter. If this counter exceeds a predetermined threshold, the P11FF code is triggered.

OBDII Code P11FF 2015 Chevrolet Silverado - Fuel Pump Command Signal Message Counter Incorrect
P11FF 2015 Chevrolet Silverado Code - Fuel Pump Command Signal Message Counter Incorrect

Common Causes of P11FF 2015 Chevrolet Silverado

  1. Faulty fuel pump or fuel pump relay.
  2. Damaged wiring or corroded connectors in the fuel pump circuit.
  3. Malfunctioning fuel pump control module.
  4. Software issues or programming errors in the ECM.
  5. Blocked fuel filter or fuel lines restricting fuel flow.

Symptoms of P11FF 2015 Chevrolet Silverado

  1. Engine stalling or hesitation during acceleration.
  2. Difficulty starting the vehicle or prolonged cranking time.
  3. Reduced fuel efficiency or poor engine performance.
  4. Illuminated check engine light on the dashboard.
  5. Unusual noises from the fuel tank area, such as whining or buzzing.

How to Fix P11FF 2015 Chevrolet Silverado

  1. Diagnostic Testing: Begin with a thorough diagnostic scan using an OBD-II scanner to confirm the P11FF code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the wiring and connectors associated with the fuel pump and ECM for signs of damage, corrosion, or loose connections.
  3. Fuel Pump Testing: Test the fuel pump and fuel pump relay for proper operation. This may involve checking fuel pressure and flow rates to ensure they meet manufacturer specifications.
  4. Replace Faulty Components: If any components are found to be defective, such as the fuel pump or control module, replace them with OEM or high-quality aftermarket parts.
  5. Reprogram or Update ECM: If software issues are suspected, reprogram or update the ECM to ensure it is functioning correctly and communicating effectively with the fuel pump control module.

Cost to Fix P11FF 2015 Chevrolet Silverado

The typical repair costs for addressing a P11FF code can vary widely based on the specific diagnosis and the components that need to be replaced. On average, you might expect to pay between $200 and $800 for parts and labor. This estimate includes the cost of a new fuel pump, relay, or control module, which can range from $100 to $500, depending on the part and brand. Labor costs will vary based on location and shop rates, which typically range from $80 to $150 per hour. In metropolitan areas or dealerships, rates may be higher, while independent shops may offer more competitive pricing. It is advisable to check local rates and obtain multiple quotes for a more precise 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 2015 Chevrolet Silverado Code

1. What does the OBDII code P11FF mean on a 2015 Chevrolet Silverado?

P11FF indicates a "Fuel Pump Command Signal Message Counter Incorrect," meaning there is a communication issue between the fuel pump control module and the engine control module (ECM).

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

Symptoms may include rough idling, engine hesitation, reduced fuel efficiency, or an illuminated check engine light.

3. What causes the P11FF code to appear?

The code is often caused by faulty wiring, a malfunctioning fuel pump control module, or a software issue in the ECM.

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

While a failing fuel pump is not a direct cause, issues with the fuel pump control module or wiring to the pump can trigger this code.

5. How is the P11FF code diagnosed?

A mechanic will inspect wiring and connections, test the fuel pump control module, and check for communication errors in the vehicle’s network.

6. Can I drive my 2015 Chevrolet Silverado with a P11FF code?

Driving with this code is not recommended, as it may cause further damage or result in poor performance due to fuel delivery issues.

7. How do you fix the P11FF code?

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

8. Is the P11FF code covered under warranty for a 2015 Chevrolet Silverado?

It depends on your vehicle’s warranty status and coverage. Check with your dealer for warranty details.

9. Can a weak battery cause the P11FF code?

Yes, a weak or failing battery can cause communication errors between modules, potentially triggering the P11FF code.

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

Repair costs vary but typically range from $150 to $500, depending on whether reprogramming, wiring repairs, or module replacement is needed.

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