B0C91 - Understanding the Body Control Module Fault in 2015-2020 Ford Explorers and Other Models

Quick Answer

B0C91 means: B0C91 indicates a fault in the Body Control Module (BCM) communication.

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

Can I drive with B0C91? Immediate attention is recommended to prevent further electrical issues.

Common Questions

What does B0C91 mean and how does it affect my car?

The B0C91 code signifies a communication issue within your vehicle's Body Control Module (BCM). This can lead to failures in various electronic systems, affecting everything from your windows to interior lights. If left unchecked, it can result in more significant electrical problems and could compromise your vehicle's safety and performance.

What are the most common causes of B0C91 and how much does it cost to fix?

The most frequent causes include damaged wiring, faulty BCM, or issues with connected sensors. Repair costs can vary widely, typically ranging from $100 for simple wiring repairs to upwards of $800 for a BCM replacement, depending on the complexity of the issue and labor rates.

Can I drive my car with B0C91 or should I stop immediately?

While it may be possible to drive your car with a B0C91 code, it is not advisable. The malfunctioning BCM can lead to unpredictable electrical behavior, which could result in safety hazards. It's best to address this issue promptly to ensure your vehicle's reliability.

How can I diagnose B0C91 myself using GeekOBD APP?

To diagnose B0C91 using the GeekOBD APP, first connect the app to your vehicle's OBD2 port. After scanning for trouble codes, look for B0C91. The app provides freeze frame data which can help you understand under what conditions the fault occurred, allowing for targeted troubleshooting of the BCM and related systems.

What vehicles are most commonly affected by B0C91?

B0C91 is frequently seen in models like the 2015-2020 Ford Explorer and certain Chrysler vehicles. Specific recalls or Technical Service Bulletins (TSBs) may exist for these models, so checking with your dealer can provide additional insights.

How can I prevent B0C91 from happening again?

Regular maintenance is key to preventing B0C91. Ensure that electrical connections are clean and secure, and consider periodic inspections of the BCM and its wiring. Additionally, avoid exposing your vehicle to excessive moisture and consider using a protective spray on electrical connections.

What is B0C91?

The diagnostic trouble code (DTC) B0C91 refers to a fault detected in the Body Control Module (BCM) of your vehicle. This code indicates that the BCM is unable to communicate correctly with the various electrical systems in your car, leading to operational issues. Commonly found in vehicles like the 2015-2020 Ford Explorer, this issue can manifest as a malfunction in various features controlled by the BCM, including power windows, door locks, and interior lighting. When the B0C91 code is triggered, it often results from wiring problems, connector issues, or even BCM failure itself. In everyday terms, if you notice that some electrical components in your car are not functioning as they should, you might be dealing with this code. Ignoring it can lead to more significant electrical failures or safety concerns, as the BCM plays a vital role in your vehicle's electronic architecture. Therefore, timely diagnosis and repair are essential to ensure your vehicle remains reliable and safe.

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

Symptoms

Common symptoms when B0C91 is present:

  • The check engine light is illuminated, indicating potential issues with the BCM or electrical system.
  • Power windows may not operate correctly, failing to open or close as expected.
  • The interior lights may flicker or fail to turn on, signaling a potential BCM issue.
  • Door locks may malfunction, either failing to lock or unlock with the key fob or switch.
  • Electrical accessories may work intermittently, causing frustration and safety concerns.

Possible Causes

Most common causes of B0C91 (ordered by frequency):

  1. The most common cause is damaged wiring or poor connections, which accounts for about 50% of cases. This can stem from wear and tear or exposure to moisture.
  2. A failing Body Control Module itself is another significant cause, often due to internal faults or software issues.
  3. Faulty sensors that feed information to the BCM can also trigger this code; regular inspections can help prevent this.
  4. Less common but serious causes include issues with the vehicle's main fuse box, which can create widespread electrical failures.
  5. In rare cases, programming errors during BCM updates can lead to this code appearing, necessitating professional recalibration.

B0C91 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring and connectors associated with the BCM.

  • Total: $100 - $300
  • Success rate: 80%
BCM Replacement

Replacing the Body Control Module if faulty.

  • Total: $300 - $800
  • Success rate: 95%
Software Update

Reprogramming the BCM to resolve software issues.

  • Total: $50 - $150
  • Success rate: 70%
Money-Saving Tips for B0C91
  • 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 B0C91 Diagnosis Process

Follow these systematic steps to accurately diagnose B0C91. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection for damaged wiring, loose connections, or corrosion around the BCM and its connectors (5-10 minutes)

Step 1: Perform an initial visual inspection for damaged wiring, loose connections, or corrosion around the BCM and its connectors (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 the GeekOBD APP to scan for all stored DTCs and review freeze frame data for context regarding the B0C91 code (10-15 minutes)

Step 2: Use the GeekOBD APP to scan for all stored DTCs and review freeze frame data for context regarding the B0C91 code (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: Conduct component testing on suspected faulty electrical parts using a multimeter to check for proper voltage and continuity (20-30 minutes)

Step 3: Conduct component testing on suspected faulty electrical parts using a multimeter to check for proper voltage and continuity (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: After repairs are made, conduct a system function test to verify that the BCM and related systems are operational before clearing the codes (10-15 minutes)

Step 4: After repairs are made, conduct a system function test to verify that the BCM and related systems are operational before clearing the codes (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: Finally, perform a road test under various conditions to ensure that all systems are working correctly and the B0C91 code does not return (15-20 minutes)

Step 5: Finally, perform a road test under various conditions to ensure that all systems are working correctly and the B0C91 code does not return (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: Ford Explorer BCM Replacement

Vehicle: 2017 Ford Explorer, 80,000 miles

Problem: Customer reported issues with power windows and intermittent check engine light.

Diagnosis: Diagnostic scan revealed B0C91. Visual inspection showed corroded wiring to the BCM.

Solution: Replaced damaged wiring and installed a new BCM. Reprogrammed the module with the latest software.

Cost: $650 (including parts and labor)

Result: All electrical systems restored to functionality, and no further issues were reported.

Case Study 2: Chrysler 300 Electrical Issues

Vehicle: 2016 Chrysler 300, 60,000 miles

Problem: Interior lights flickering and door locks malfunctioning.

Diagnosis: B0C91 was present. Inspection found loose connections at the BCM.

Solution: Tightened connections and performed a software update on the BCM.

Cost: $120 (minimal parts involved)

Result: Resolved the flickering lights and door locks operated normally after the fix.

Diagnose B0C91

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: B0C91
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes