B0D91 - Understanding the Diagnostic Trouble Code in 2015-2019 Ford F-150 and Other Models

Quick Answer

B0D91 means: B0D91 indicates a communication failure within the Body Control Module.

Fix: Check and replace faulty components Cost: $300 - $700 Time: 90-180 minutes

Can I drive with B0D91? Immediate attention is recommended to prevent further electrical issues.

Common Questions

What does B0D91 mean and how does it affect my car?

B0D91 indicates a communication issue within your vehicle's Body Control Module. This can affect various electronic components and potentially lead to safety issues if not addressed. It’s important to understand that while your car might still be operational, ignoring this code could result in more severe electrical failures.

What are the most common causes of B0D91 and how much does it cost to fix?

Common causes include a faulty Body Control Module, damaged wiring, or corroded connectors. Repair costs can vary; replacing the BCM typically ranges from $300 to $700, while wiring repairs might cost $100 to $300.

Can I drive my car with B0D91 or should I stop immediately?

While you may be able to drive your vehicle, it’s advised to address the B0D91 code as it can lead to unsafe conditions. If you notice any severe symptoms like power failures or starting issues, it's best to stop driving and have the vehicle checked.

How can I diagnose B0D91 myself using GeekOBD APP?

You can use the GeekOBD APP to perform an OBD2 scan on your vehicle. This will provide you with the DTCs and freeze frame data, helping you understand the context of the fault. Look for additional codes that might be related to B0D91 and note any symptoms you're experiencing.

What vehicles are most commonly affected by B0D91?

B0D91 is frequently seen in 2015-2019 Ford F-150 models, but it can also affect other Ford vehicles from this period. It's essential to stay updated on any recalls or technical service bulletins related to your specific model.

How can I prevent B0D91 from happening again?

Regular maintenance checks, including inspections of the BCM and associated wiring, can help prevent B0D91. Keeping connectors clean and dry, along with timely software updates, is also crucial.

What is B0D91?

DTC B0D91 is a diagnostic trouble code that indicates a fault in the vehicle’s Body Control Module (BCM) communication. When this code is triggered, it generally means that the BCM is unable to communicate properly with other modules, which can lead to various electronic and operational issues in your vehicle. For example, in 2015-2019 Ford F-150 models, this can result in problems with lighting, power windows, or even issues with the vehicle's ignition system. The BCM monitors and controls multiple functions such as door locks, lights, and other electronic accessories, so when it fails to communicate, it can cause a cascade of problems. Drivers may notice that features like automatic door locks or interior lights do not operate as expected. Ignoring this code can lead to more significant electrical failures, potentially impacting the vehicle’s drivability. Therefore, it is essential for owners to address this issue promptly to avoid further complications and ensure the vehicle remains safe and reliable. Additionally, understanding this code can help save on repair costs by allowing owners to convey specific symptoms to their technician, leading to faster diagnostics and resolution.

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

Symptoms

Common symptoms when B0D91 is present:

  • The check engine light remains illuminated, indicating an underlying issue needs attention.
  • Power windows may fail to respond when activated, leading to inconvenience and safety concerns.
  • Interior and exterior lights flicker or fail to operate correctly, impacting visibility and safety.
  • Automatic door locks may not function, posing a security risk.
  • The vehicle may experience intermittent starting issues, especially in colder weather.

Possible Causes

Most common causes of B0D91 (ordered by frequency):

  1. The most common cause is a faulty Body Control Module, which occurs in about 60% of cases. This can result from internal failure or exposure to moisture.
  2. A second potential cause is damaged wiring or loose connections, which can disrupt communication. This is often due to wear and tear or improper installations.
  3. Corrosion on connectors, especially in older vehicles, can lead to communication issues, so regular inspections can help prevent this.
  4. Less commonly, software glitches in the BCM can cause communication errors, usually resolvable through a software update.
  5. A rare but possible cause is an issue with the vehicle’s main computer, which can cause multiple trouble codes to display.

B0D91 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing a faulty Body Control Module with a new OEM part.

  • Total: $300 - $700
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connections that disrupt BCM communication.

  • Total: $100 - $300
  • Success rate: 90%
Software Update

Updating the BCM software to resolve communication issues.

  • Total: $50 - $150
  • Success rate: 75%
Money-Saving Tips for B0D91
  • 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 B0D91 Diagnosis Process

Follow these systematic steps to accurately diagnose B0D91. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of the BCM and associated wiring to check for visible damage or corrosion (5-10 minutes)

Step 1: Conduct an initial visual inspection of the BCM and associated wiring to check for 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 the GeekOBD APP to perform an OBD2 scan and retrieve all diagnostic trouble codes, noting any additional codes that may provide context (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan and retrieve all diagnostic trouble codes, noting any additional codes that may provide 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 BCM using a multimeter to check for voltage and ground signals at the module connectors, ensuring they are within specifications (20-30 minutes)

Step 3: Test the BCM using a multimeter to check for voltage and ground signals at the module connectors, ensuring they are within 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: After repairs, perform a system function test to ensure all electronic components are functioning correctly and clear the codes from the memory (10-15 minutes)

Step 4: After repairs, perform a system function test to ensure all electronic components are functioning correctly and clear the codes from the memory (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 to confirm that the issues have been resolved and that the DTC does not reappear (15-20 minutes)

Step 5: Conduct a road test to confirm that the issues have been resolved and that the DTC does not reappear (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: BCM Replacement Success in 2017 Ford F-150

Vehicle: 2017 Ford F-150, 50,000 miles

Problem: Customer reported frequent electrical failures, including non-functioning power windows and flickering dashboard lights.

Diagnosis: Using the GeekOBD APP, we confirmed the presence of DTC B0D91 along with several other related codes. A visual inspection revealed corrosion at the BCM connectors.

Solution: Replaced the Body Control Module and cleaned all connectors to ensure proper communication.

Cost: $500 (parts: BCM $400, labor $100)

Result: After the repair, all electrical systems functioned correctly, and the customer reported no further issues.

Case Study 2: Wiring Repair in 2016 Ford Explorer

Vehicle: 2016 Ford Explorer, 70,000 miles

Problem: Driver experienced intermittent starting issues and malfunctioning interior lighting.

Diagnosis: Diagnostic scanning revealed DTC B0D91. A thorough inspection found frayed wiring near the BCM.

Solution: Repaired the damaged wiring and resecured all connections.

Cost: $200 (parts: wiring connectors $50, labor $150)

Result: Post-repair testing confirmed the issues were resolved, and the vehicle started reliably.

Diagnose B0D91

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: B0D91
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes