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P15FB 2017 GMC Sierra Code - Brake Pedal Position Sensor Signal Message Counter Incorrect

Quick Answer

The P15FB diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Brake Pedal Position Sensor Signal Message Counter is Incorrect. Common causes include Faulty brake pedal position sensor, Damaged wiring or connectors related to the sensor, Corrosion or poor connections in the sensor circuit. 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
P15FB 2017 GMC Sierra indicates Brake Pedal Position Sensor Signal Message Counter Incorrect.
Common causes
Common causes include Faulty brake pedal position sensor, Damaged wiring or connectors related to the sensor, Corrosion or poor connections in the sensor circuit.
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 13, 2024
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Code P15FB 2017 GMC Sierra Description

The P15FB diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Brake Pedal Position Sensor Signal Message Counter is Incorrect. This code is typically triggered when the signal message counter from the brake pedal position sensor does not align with the expected values stored in the vehicle's computer system. The brake pedal position sensor is a crucial component that helps determine the driver's intended braking force and assists in various safety systems, such as traction control and stability control. When this sensor malfunctions or sends incorrect signals, it can lead to a range of issues affecting the vehicle's performance and safety.

OBDII Code P15FB 2017 GMC Sierra - Brake Pedal Position Sensor Signal Message Counter Incorrect
P15FB 2017 GMC Sierra Code - Brake Pedal Position Sensor Signal Message Counter Incorrect

Common Causes of P15FB 2017 GMC Sierra

  1. Faulty brake pedal position sensor.
  2. Damaged wiring or connectors related to the sensor.
  3. Corrosion or poor connections in the sensor circuit.
  4. Issues with the electronic control module (ECM) processing the sensor signals.

Symptoms of P15FB 2017 GMC Sierra

  1. Dashboard warning lights, such as ABS or traction control lights, illuminating.
  2. Inconsistent or unpredictable braking response.
  3. Longer stopping distances than usual.
  4. Complete loss of braking ability in extreme cases.

How to Fix P15FB 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the brake pedal position sensor, wiring, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the sensor's output signals and compare them to the manufacturer's specifications.
  3. If the sensor is faulty, replace it with a new, OEM-quality component.
  4. Clear the DTC from the vehicle's computer system using a diagnostic scan tool.
  5. Test drive the vehicle to ensure the braking system functions correctly and that the warning lights no longer illuminate.

Cost to Fix P15FB 2017 GMC Sierra

The typical repair costs for addressing the P15FB code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a faulty brake pedal position sensor can range from $100 to $200, while addressing wiring or connector issues may add to the total cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates can vary based on location, vehicle make and model, and other factors. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle in question.

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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 P15FB 2017 GMC Sierra Code

1. What does the OBDII code P15FB mean on a 2017 GMC Sierra?

P15FB indicates an issue with the brake pedal position sensor, specifically that its signal message counter is incorrect or not functioning as expected.

2. What are the symptoms of code P15FB on a 2017 GMC Sierra?

Symptoms may include the illumination of the check engine light, brake system warning lights, erratic brake light operation, or issues with cruise control functionality.

3. What causes the P15FB code to appear on a 2017 GMC Sierra?

Common causes include a malfunctioning brake pedal position sensor, damaged wiring or connectors in the brake pedal sensor circuit, or a fault in the vehicle's electronic control module (ECM).

4. Can I drive my 2017 GMC Sierra with the P15FB code?

While the vehicle may still be drivable, it’s not recommended as the issue could affect braking-related systems, such as brake lights or cruise control, potentially leading to unsafe driving conditions.

5. How is the P15FB code diagnosed on a 2017 GMC Sierra?

A technician will use a scan tool to retrieve the code, inspect the brake pedal position sensor and its wiring, and test the sensor signal with a multimeter or oscilloscope to confirm the issue.

6. How do I fix the P15FB code on my 2017 GMC Sierra?

Repairs typically involve replacing the faulty brake pedal position sensor, repairing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the ECM.

7. How much does it cost to repair the P15FB code on a 2017 GMC Sierra?

Repair costs can vary but typically range from $150 to $300, depending on whether the issue is limited to the sensor or involves additional wiring or ECM repairs.

8. Can a faulty brake pedal position sensor cause other problems in my 2017 GMC Sierra?

Yes, a faulty sensor can lead to issues with brake light operation, cruise control malfunction, or incorrect communication with other vehicle systems like stability control.

9. Is the P15FB code a common issue in the 2017 GMC Sierra?

While not extremely common, it can occur due to wear and tear on the brake pedal position sensor or related electrical components over time.

10. Can I reset the P15FB code without fixing the issue?

Clearing the code with a scan tool may temporarily turn off the warning light, but the issue will likely return unless the underlying problem is resolved.

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