B0F5B - Diagnosing DTC B0F5B: Common Issues in 2018-2022 Ford F-150 and Other Models

Quick Answer

B0F5B means: B0F5B indicates a malfunction in the rear lighting control circuit, primarily affecting the tail lights and brake lights.

Fix: Check and replace faulty components Cost: $20 - $50 Time: 90-180 minutes

Can I drive with B0F5B? Immediate attention is recommended due to safety concerns related to visibility.

Common Questions

What does B0F5B mean and how does it affect my car?

The B0F5B code indicates a malfunction in the rear lighting control circuit, which can lead to unsafe driving conditions due to visibility issues. It's essential to address this code promptly to ensure that your brake and tail lights function correctly.

What are the most common causes of B0F5B and how much does it cost to fix?

Common causes include faulty light bulbs, short circuits in wiring, and faulty body control modules. Repair costs can range from $20 for bulb replacements to $800 for BCM replacements, depending on the issue.

Can I drive my car with B0F5B or should I stop immediately?

It is not safe to drive with this code active, as it can indicate that your rear lights are not functioning correctly. It's best to have the issue diagnosed and repaired before driving again.

How can I diagnose B0F5B myself using GeekOBD APP?

You can use the GeekOBD APP to scan for DTCs, view freeze frame data, and monitor live data from the BCM. This will help you pinpoint the issue more accurately before any repairs.

What vehicles are most commonly affected by B0F5B?

This code is frequently seen in 2018-2022 Ford F-150 models, as well as other Ford vehicles equipped with similar body control systems. Owners should be aware of any recalls or technical service bulletins related to rear lighting issues.

How can I prevent B0F5B from happening again?

To prevent this code, regularly inspect your vehicle's lighting system for signs of wear, replace bulbs as needed, and ensure that the wiring connections are kept clean and free of corrosion.

What is B0F5B?

The diagnostic trouble code (DTC) B0F5B indicates a problem related to the vehicle's body control module (BCM), specifically associated with the rear lighting control circuit. This code can be triggered in various vehicles, but it is notably common in Ford models, especially the 2018-2022 Ford F-150. When this code is present, it indicates that the BCM is detecting an abnormality in the rear lighting system, which may include tail lights, brake lights, or turn signals. The primary concern is that the BCM has received a signal indicating that one or more of these lights are malfunctioning or have failed to operate as intended. This can lead to various symptoms, including dashboard warning lights, flickering lights, or even complete light failure. Ignoring this code can result in reduced safety on the road due to impaired visibility and signaling to other drivers. Additionally, failure to address the underlying issues related to this code could lead to more extensive electrical problems within the vehicle. Addressing the B0F5B code promptly is crucial for maintaining both vehicle safety and compliance with driving regulations.

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

Symptoms

Common symptoms when B0F5B is present:

  • Check engine light stays on constantly, indicating an ongoing issue that needs addressing.
  • Dashboard warning lights for rear lights illuminate, alerting the driver of potential lighting failures.
  • Tail lights or brake lights flicker erratically, which can be dangerous while driving at night or during low visibility.
  • Complete failure of rear lights, making it impossible for other drivers to see your signals.
  • Increased battery drain due to BCM malfunction, leading to potential starting problems.

Possible Causes

Most common causes of B0F5B (ordered by frequency):

  1. The most common cause of B0F5B is a faulty rear light bulb, which accounts for about 40% of cases. This can result from bulb burnout or poor bulb connection.
  2. A second potential cause is a short circuit in the wiring harness, which can develop over time due to wear and tear or exposure to moisture, leading to approximately 30% of instances.
  3. Thirdly, a malfunctioning body control module (BCM) itself can trigger this code, with a likelihood of around 20%. This requires in-depth diagnostics to confirm.
  4. Less common but serious causes include corrosion at the connector points, which can affect the electrical connection and lead to intermittent issues.
  5. A rare cause could be software bugs within the BCM, which may require software updates or reprogramming to resolve.

B0F5B Repair Costs

Cost Breakdown by Repair Type

Rear Light Bulb Replacement

Replacing burnt-out bulbs in the rear lighting system.

  • Total: $20 - $50
  • Success rate: 90%
Wiring Harness Repair

Repairing or replacing damaged wiring in the rear lighting circuit.

  • Total: $100 - $300
  • Success rate: 85%
BCM Replacement

Replacing the body control module if found faulty during diagnostics.

  • Total: $300 - $800
  • Success rate: 95%
Money-Saving Tips for B0F5B
  • 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 B0F5B Diagnosis Process

Follow these systematic steps to accurately diagnose B0F5B. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion, which should take about 5-10 minutes

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion, which should take about 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: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, this process typically takes 10-15 minutes

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, this process typically takes 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: Component testing - Use a multimeter or specific diagnostic tools to test suspected components such as bulbs and wiring, allowing 20-30 minutes for thorough testing

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components such as bulbs and wiring, allowing 20-30 minutes for thorough testing.

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: System function test - Verify proper operation after repairs and clear codes to ensure the issue has been resolved, which should take another 10-15 minutes

Step 4: System function test - Verify proper operation after repairs and clear codes to ensure the issue has been resolved, which should take another 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: Road test verification - Drive the vehicle under various conditions to confirm repair success, allowing 15-20 minutes for this step

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, allowing 15-20 minutes for this step.

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: 2019 Ford F-150 Rear Light Malfunction

Vehicle: 2019 Ford F-150, 45,000 miles

Problem: Customer reported that the rear lights would flicker and occasionally fail to illuminate.

Diagnosis: After a thorough inspection, a burnt-out tail light bulb was identified as the primary cause of the B0F5B code.

Solution: Replaced the burnt-out bulb and cleared the code. The rear lights were verified to function correctly afterward.

Cost: $45 (including parts and labor)

Result: Customer reported no further issues with rear lighting post-repair.

Case Study 2: 2018 Ford Explorer BCM Replacement

Vehicle: 2018 Ford Explorer, 60,000 miles

Problem: Customer experienced intermittent rear lighting issues and dashboard warnings.

Diagnosis: Diagnostics revealed that the BCM was malfunctioning, triggering the B0F5B code.

Solution: Replaced the body control module and updated the software.

Cost: $600 (including parts and labor)

Result: All rear lighting functions were restored, and the customer was satisfied with the repair.

Diagnose B0F5B

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: B0F5B
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes