B07B4 - Understanding the Code and Its Impact on Your 2015-2020 Ford Explorer and Other Models

Quick Answer

B07B4 means: B07B4 indicates a malfunction in the left rear lamp circuit of the BCM.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with B07B4? Immediate attention is recommended to ensure safety and compliance.

Common Questions

What does B07B4 mean and how does it affect my car?

The B07B4 code means there's an issue with the left rear lamp circuit, which can lead to failures in your brake lights and other components. This not only affects your vehicle's safety but can also lead to more significant electrical problems if neglected.

What are the most common causes of B07B4 and how much does it cost to fix?

Common causes of B07B4 include faulty wiring (60% likelihood), a malfunctioning BCM (25%), and improperly installed lamps (10%). Repair costs can range from $100 to $600 depending on the issue.

Can I drive my car with B07B4 or should I stop immediately?

While you may still drive the vehicle, it's not recommended as the malfunction could lead to brake light failure, increasing the risk of an accident. It's best to address this code as soon as possible.

How can I diagnose B07B4 myself using GeekOBD APP?

To diagnose B07B4 using the GeekOBD APP, connect your OBD2 scanner, retrieve the fault codes, and check the live data for the left rear lamp circuit. This will help you pinpoint the issue before taking further action.

What vehicles are most commonly affected by B07B4?

B07B4 is frequently seen in models like the 2015-2020 Ford Explorer, Ford F-150, and certain Lincoln models. If you own one of these vehicles, it's essential to be aware of this code.

How can I prevent B07B4 from happening again?

Regularly inspect your vehicle's lighting and electrical systems, ensure proper installation of bulbs, and consider periodic BCM software updates to prevent issues from arising.

What is B07B4?

The diagnostic trouble code B07B4 indicates a problem within the vehicle's Body Control Module (BCM) related to the left rear lamp circuit. This code is commonly seen in various vehicles, including the 2015-2020 Ford Explorer, and signifies that the BCM has detected an issue such as a malfunction in the left rear light or its associated wiring. When B07B4 is triggered, it can lead to various symptoms, including failure of the left rear brake light, which may pose safety risks during nighttime driving or inclement weather. Ignoring this code could eventually lead to further electrical problems, affecting other vehicle systems and potentially leading to costly repairs. For car owners, understanding this code is crucial as it not only indicates a malfunction but also serves as a warning to address the issue promptly to avoid further complications. If you notice any warning lights or changes in your vehicle's performance, having the B07B4 code diagnosed and repaired as soon as possible is advisable.

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

Symptoms

Common symptoms when B07B4 is present:

  • Check engine light illuminates, indicating an electrical issue.
  • Left rear brake light is malfunctioning or not functioning at all, which can lead to unsafe driving conditions.
  • Inconsistent electrical operation of other components, such as rear turn signals, due to potential wiring issues.
  • Increased battery drain if the BCM is continuously trying to correct the fault.
  • Occasional flickering of the dashboard lights when applying brakes due to intermittent BCM communication.

Possible Causes

Most common causes of B07B4 (ordered by frequency):

  1. The most common cause of B07B4 is faulty wiring or connectors in the left rear lamp circuit, occurring in about 60% of cases. Check for breaks, shorts, or corrosion.
  2. A malfunctioning Body Control Module itself can trigger this code, accounting for roughly 25% of cases. This may require a professional diagnosis and replacement.
  3. Improperly installed or damaged left rear lamps can also lead to this code, with about 10% likelihood. Ensure bulbs are correctly seated and connections are secure.
  4. Less common but serious causes include water intrusion into the BCM, which can lead to short circuits and system failures. This requires immediate inspection.
  5. Rarely, software issues within the BCM can cause false readings, often resolved through a software update or reprogramming.

B07B4 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair or Replacement

Repairing or replacing damaged wiring in the left rear lamp circuit.

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

Replacing the faulty Body Control Module if diagnosed as the issue.

  • Total: $300 - $600
  • Success rate: 90%
Money-Saving Tips for B07B4
  • 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 B07B4 Diagnosis Process

Follow these systematic steps to accurately diagnose B07B4. 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 (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, 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: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes 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: Component testing - Use a multimeter to check voltage at the left rear lamp circuit and inspect the BCM for any faults (20-30 minutes)

Step 3: Component testing - Use a multimeter to check voltage at the left rear lamp circuit and inspect the BCM for any faults (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: System function test - After repairs, verify proper operation and clear codes to ensure the issue is resolved (10-15 minutes)

Step 4: System function test - After repairs, verify proper operation and clear codes to ensure the issue is resolved (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 that the repair has resolved the issue (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair has resolved the issue (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: Repair Case: 2018 Ford Explorer with B07B4

Vehicle: 2018 Ford Explorer, 45,000 miles

Problem: Owner reported left rear brake light not functioning.

Diagnosis: Visual inspection revealed corroded connectors in the left rear lamp circuit.

Solution: Replaced corroded connectors and ensured secure wiring.

Cost: $150 (parts and labor)

Result: Brake light function restored, no further issues after road test.

Case Study 2: Repair Case: 2016 Ford F-150 with B07B4

Vehicle: 2016 Ford F-150, 60,000 miles

Problem: Owner experienced intermittent left rear light failures.

Diagnosis: Diagnostic scan showed B07B4; BCM tested faulty.

Solution: Replaced Body Control Module with OEM part.

Cost: $450 (including BCM and labor)

Result: All lighting functions restored, owner satisfied with repair.

Diagnose B07B4

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: B07B4
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes