Quick Answer
B104A means: B104A indicates a communication error with the Body Control Module.
Can I drive with B104A? Address this issue as soon as possible to avoid more severe electrical problems.
Common Questions
What does B104A mean and how does it affect my car?
B104A indicates a problem with communication between your Body Control Module and other parts of your vehicle. This can lead to issues with electronic features such as windows and lights, affecting both convenience and safety.
What are the most common causes of B104A and how much does it cost to fix?
Common causes include damaged wiring, a faulty BCM, and corroded connections. Repair costs can vary, ranging from $50 for cleaning connections to $600 for a BCM replacement.
Can I drive my car with B104A or should I stop immediately?
While you may still drive your vehicle, it's advisable to address the B104A code promptly as it can affect critical electronic functions and may lead to safety hazards.
How can I diagnose B104A myself using GeekOBD APP?
You can use the GeekOBD APP to scan for codes and view live data from your vehicle's systems, which helps you pinpoint where communication issues may be occurring in the BCM's operation.
What vehicles are most commonly affected by B104A?
Vehicles from manufacturers like Ford, Chevrolet, and Dodge, particularly models from the years 2010-2018, frequently experience the B104A code due to BCM-related problems.
How can I prevent B104A from happening again?
To prevent future occurrences of B104A, regularly inspect electrical connections, keep your vehicle's interior dry to avoid water ingress, and perform routine maintenance on electronic systems.
What is B104A?
The diagnostic trouble code (DTC) B104A indicates a communication error related to the Body Control Module (BCM) in your vehicle. The BCM is a crucial component that oversees various electronic systems, including lighting, power windows, and door locks. A B104A code typically means that the BCM is unable to communicate with other modules in the vehicle, which can result in several electronic features malfunctioning. This issue can arise from various factors such as damaged wiring, poor connections, or faults within the BCM itself. In simpler terms, if your car is experiencing this code, it may show signs like flickering lights or non-functioning electronic features. Ignoring this code can lead to more significant problems, as it can affect your vehicle's overall electrical system and safety features. For instance, if your BCM fails entirely, you may find yourself unable to operate essential functions like your headlights or windshield wipers. It's vital to address this code promptly to ensure the proper functioning of your vehicle's electronic systems.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B104A is present:
- The check engine light may illuminate on your dashboard, staying on constantly until the issue is resolved.
- You might notice that certain electronic features, like the power windows or door locks, are not functioning properly.
- Electrical systems may behave erratically, such as headlights dimming or flickering unexpectedly.
- In some cases, your vehicle's alarm system might activate randomly or fail to respond.
- You may experience issues with the vehicle's ignition system, making it difficult to start your car.
Possible Causes
Most common causes of B104A (ordered by frequency):
- The most common cause of the B104A code is damaged wiring related to the BCM, which can occur in about 40% of cases due to wear and tear or accidental damage.
- A second possible cause could be a faulty BCM itself, which may happen in around 30% of instances. This can be due to manufacturing defects or electrical surges.
- Poor connections or corroded terminals can lead to signal loss between the BCM and other modules, making this the third most frequent cause, accounting for roughly 20% of cases.
- Less common but serious causes include water ingress into the BCM area, which can lead to short circuits and system failures.
- A rare cause could be software corruption within the BCM, which may require a reprogramming of the module to resolve.
B104A Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repairing or replacing damaged wiring associated with the BCM.
- Total: $100 - $300
- Success rate: 85%
BCM Replacement
Replacing the Body Control Module if it is found to be faulty.
- Total: $300 - $600
- Success rate: 90%
Connection Cleaning
Cleaning and resealing corroded connections and terminals.
- Total: $50 - $150
- Success rate: 70%
Money-Saving Tips for B104A
- 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 B104A Diagnosis Process
Follow these systematic steps to accurately diagnose B104A. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Conduct an initial visual inspection to identify any damaged wiring, loose connections, or signs of corrosion, which should take about 5-10 minutes
Step 1: Conduct an initial visual inspection to identify any damaged wiring, loose connections, or signs of corrosion, which should take about 5-10 minutes.
Step 2: Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all diagnostic codes and freeze frame data to understand the context of the fault, requiring 10-15 minutes
Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all diagnostic codes and freeze frame data to understand the context of the fault, requiring 10-15 minutes.
Step 3: Step 3: Perform component testing using a multimeter to test the voltage and ground connections to the BCM and associated components, taking approximately 20-30 minutes
Step 3: Perform component testing using a multimeter to test the voltage and ground connections to the BCM and associated components, taking approximately 20-30 minutes.
Step 4: Step 4: Conduct a system function test to verify the operation of the BCM and clear any codes after making repairs, which should take about 10-15 minutes
Step 4: Conduct a system function test to verify the operation of the BCM and clear any codes after making repairs, which should take about 10-15 minutes.
Step 5: Step 5: Execute a road test to monitor the vehicle under various conditions to ensure the problem has been resolved, requiring 15-20 minutes
Step 5: Execute a road test to monitor the vehicle under various conditions to ensure the problem has been resolved, requiring 15-20 minutes.
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 on a 2017 Ford Fusion
Vehicle: 2017 Ford Fusion, 45,000 miles
Problem: Owner reported flickering lights and non-responsive power windows.
Diagnosis: An OBD2 scan revealed a B104A code. Visual inspection showed corroded wiring harness leading to the BCM.
Solution: Replaced the damaged wiring and installed a new BCM, followed by a system function test.
Cost: $550 (including parts and labor)
Result: All electronic functions restored; owner reported no issues after follow-up.
Case Study 2: Connection Cleaning on a 2015 Chevy Malibu
Vehicle: 2015 Chevy Malibu, 60,000 miles
Problem: Customer experienced intermittent alarm activations and inoperative door locks.
Diagnosis: The GeekOBD APP revealed a B104A code. Inspection found corroded connectors at the BCM.
Solution: Cleaned the connectors and applied a sealant to prevent future corrosion.
Cost: $120 (for labor and materials)
Result: Issues resolved; customer satisfied with the low-cost repair.