B04FA - Brake Pedal Position Sensor Circuit Range/Performance Problem in 2015-2020 Chevrolet Silverado

Quick Answer

B04FA means: B04FA indicates a problem with the brake pedal position sensor circuit, affecting braking performance.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with B04FA? Immediate attention is recommended to ensure safety.

Common Questions

What does B04FA mean and how does it affect my car?

The B04FA code signifies an issue with the brake pedal position sensor circuit. If this sensor fails, it can lead to erratic braking, potential ABS failure, and increased stopping distances, posing safety risks while driving.

What are the most common causes of B04FA and how much does it cost to fix?

Common causes include a faulty brake pedal position sensor, wiring issues, and corrosion. Repair costs can range from $100 to $300, depending on the necessary repairs.

Can I drive my car with B04FA or should I stop immediately?

You should stop driving immediately if B04FA is triggered, as it can impact braking performance and safety. It's crucial to have the issue diagnosed and repaired as soon as possible.

How can I diagnose B04FA myself using GeekOBD APP?

Using the GeekOBD APP, connect to your vehicle's OBD2 port to read the DTCs. Look for the B04FA code and analyze the freeze frame data for any additional context that can help pinpoint the issue.

What vehicles are most commonly affected by B04FA?

The B04FA code is frequently observed in 2015-2020 models of Chevrolet Silverado and GMC Sierra. Checking for any recalls or TSBs (Technical Service Bulletins) related to this code is advisable.

How can I prevent B04FA from happening again?

Regularly inspect the brake system components for wear and corrosion, especially the wiring and connectors. Ensure that the brake pedal position sensor is functioning correctly during routine maintenance checks.

What is B04FA?

The B04FA diagnostic trouble code (DTC) indicates a malfunction in the brake pedal position sensor circuit. This sensor plays a critical role in the vehicle's braking system by informing the engine control unit (ECU) of the brake pedal's position, which helps control various aspects of vehicle performance, including transmission behavior and anti-lock braking system (ABS) operation. When the B04FA code is triggered, it means that the ECU has detected an out-of-range signal from the brake pedal position sensor. This could lead to a range of problems, including erratic braking behavior, potential failure of the ABS system, and in some cases, increased stopping distances, which can compromise safety. It's crucial for drivers to address this issue promptly to ensure safe driving conditions. Common symptoms include a warning light on the dashboard, inconsistent braking response, and the vehicle may enter limp mode, reducing engine power to protect the system. Understanding this code is vital for car owners who want to maintain their vehicle's performance and safety.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B04FA is present:

  • Check engine light remains illuminated consistently, indicating a fault in the brake system.
  • Inconsistent braking response; the brake pedal may feel spongy or require more force than usual to engage.
  • ABS warning light may illuminate, indicating a potential failure in the anti-lock braking system.
  • Vehicle may enter a limp mode, limiting engine power to protect the system.
  • Unexpected changes in transmission behavior, such as rough shifting or delayed engagement.

Possible Causes

Most common causes of B04FA (ordered by frequency):

  1. The most common cause is a faulty brake pedal position sensor, occurring in about 60% of cases. This component may wear out or fail due to exposure to moisture or physical damage.
  2. Another common cause is wiring issues, such as frayed wires or poor connections, which can result in intermittent signals to the ECU.
  3. Corrosion in the connector pins can also lead to poor electrical contact, resulting in a faulty reading from the brake pedal position sensor.
  4. Less common but serious causes include ECU malfunction, which could result in complete loss of brake system functionality.
  5. A rare cause could be a fault in the ABS module, which may require specialized testing to diagnose.

B04FA Repair Costs

Cost Breakdown by Repair Type

Brake Pedal Position Sensor Replacement

Replacing the faulty brake pedal position sensor with a new OEM part.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring and connectors in the brake pedal position sensor circuit.

  • Total: $100 - $200
  • Success rate: 75%
Money-Saving Tips for B04FA
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B04FA Diagnosis Process

Follow these systematic steps to accurately diagnose B04FA. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform a visual inspection of the brake pedal position sensor wiring and connectors for any visible damage or corrosion (5-10 minutes)

Step 1: Perform a visual inspection of the brake pedal position sensor wiring and connectors for any visible damage or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: Use an OBD2 scanner with GeekOBD APP to retrieve DTCs and freeze frame data to understand the fault context (10-15 minutes)

Step 2: Use an OBD2 scanner with GeekOBD APP to retrieve DTCs and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Test the brake pedal position sensor using a multimeter to check for proper voltage and resistance levels according to the manufacturer's specifications (20-30 minutes)

Step 3: Test the brake pedal position sensor using a multimeter to check for proper voltage and resistance levels according to the manufacturer's specifications (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: Clear the codes and perform a system function test to verify proper operation after any repairs (10-15 minutes)

Step 4: Clear the codes and perform a system function test to verify proper operation after any repairs (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Conduct a road test under various conditions to confirm that the issue has been resolved (15-20 minutes)

Step 5: Conduct a road test under various conditions to confirm that the issue has been resolved (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Brake Sensor Replacement in 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado 1500, 45,000 miles

Problem: The driver reported the check engine light was on and experienced inconsistent braking.

Diagnosis: After using the GeekOBD APP, B04FA was retrieved. A visual inspection revealed a damaged brake pedal position sensor.

Solution: Replaced the brake pedal position sensor with an OEM part, reconnected everything properly.

Cost: $250 (sensor $180, labor $70)

Result: The issue was resolved, and the check engine light no longer illuminated.

Case Study 2: Wiring Repair in 2018 GMC Sierra

Vehicle: 2018 GMC Sierra 1500, 30,000 miles

Problem: Customer complained of ABS warning light and poor braking response.

Diagnosis: Diagnosis with GeekOBD APP showed B04FA. Inspection revealed frayed wiring in the brake pedal position sensor circuit.

Solution: Repaired the wiring and ensured all connections were secure.

Cost: $150 (wiring repair $100, labor $50)

Result: Braking performance returned to normal, and the ABS warning light was cleared.

Diagnose B04FA

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B04FA
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes