Quick Answer
U0B86 means: U0B86 indicates a communication error with the body control module.
Can I drive with U0B86? Immediate attention is recommended to prevent further electrical issues.
Common Questions
What does U0B86 mean and how does it affect my car?
The U0B86 code signifies a communication issue with the body control module, which can affect various electronic features in your vehicle. If left unaddressed, it can lead to more severe electrical problems.
What are the most common causes of U0B86 and how much does it cost to fix?
Common causes include a faulty BCM, damaged wiring, or software glitches, with repair costs ranging from $100 for a software update to $800 for a BCM replacement.
Can I drive my car with U0B86 or should I stop immediately?
While you may still be able to drive your vehicle, it's advisable to address the U0B86 code promptly to avoid further complications with electrical systems.
How can I diagnose U0B86 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for codes, view live data, and check for freeze frame information to help identify the problem areas related to the U0B86 code.
What vehicles are most commonly affected by U0B86?
The U0B86 code is commonly found in vehicles from manufacturers such as Ford, Chevrolet, and Honda, particularly models produced between 2015 and 2020.
How can I prevent U0B86 from happening again?
To prevent future occurrences of U0B86, ensure regular maintenance of your vehicle’s electrical systems, including inspections for corrosion and updates for BCM software.
What is U0B86?
The DTC U0B86 is a communication error code that typically indicates a problem within the vehicle's body control module (BCM) or related systems. This code is often associated with issues in the network communication between the BCM and other modules like the engine control unit (ECU) or transmission control module (TCM). When a vehicle generates the U0B86 code, it can lead to various operational issues including the malfunction of interior and exterior lights, power windows, and other electronic functions that rely on the BCM. For car owners, this means that while the vehicle may still run, there could be numerous systems that are not functioning properly, which can lead to further complications if not addressed promptly. Affected vehicles include models from manufacturers like Ford, Chevrolet, and Honda, particularly those produced between 2015 and 2020. Ignoring this code can result in more significant electrical problems down the line, and thus it is crucial to have it diagnosed and repaired as soon as possible.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0B86 is present:
- Check engine light stays on constantly, indicating an underlying issue that needs attention.
- Interior lights flicker or fail to operate, affecting visibility and convenience.
- Power windows may intermittently fail, causing frustration and inconvenience.
- Malfunctioning keyless entry system that may not unlock or lock the doors as intended.
- Dashboard warning lights may illuminate unexpectedly, indicating potential electrical faults.
Possible Causes
Most common causes of U0B86 (ordered by frequency):
- The most common cause of U0B86 is a faulty body control module (BCM), which has a likelihood of around 60%. The BCM is responsible for numerous electronic functions, and any failure can disrupt communication.
- Another possible cause is damaged wiring or connectors within the BCM circuit, contributing to about 25% of cases. Corrosion or wear can lead to intermittent connection issues.
- A third cause could be software glitches in the BCM, which can sometimes be resolved with a simple firmware update. Regularly checking for software updates can prevent this issue.
- Less common but serious causes include short circuits in the wiring harness, which may require extensive repairs if located.
- Lastly, a rare but possible cause is a malfunctioning CAN bus, the communication network that links various modules. This can lead to complex issues and may require professional diagnosis.
U0B86 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the faulty body control module with a new one.
- Total: $400 - $800
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connectors in the BCM circuit.
- Total: $150 - $300
- Success rate: 80%
Software Update
Updating the BCM software to resolve communication issues.
- Total: $100 - $150
- Success rate: 75%
Money-Saving Tips for U0B86
- 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 U0B86 Diagnosis Process
Follow these systematic steps to accurately diagnose U0B86. 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).
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).
Step 3: Step 3: Component testing - Use multimeter or specific diagnostic tools to test suspected components, particularly the BCM and associated wiring (20-30 minutes)
Step 3: Component testing - Use multimeter or specific diagnostic tools to test suspected components, particularly the BCM and associated wiring (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes with the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes with the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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 in a 2017 Honda Accord
Vehicle: 2017 Honda Accord, 50,000 miles
Problem: Customer reported malfunctioning interior lights and persistent check engine light.
Diagnosis: After scanning with GeekOBD APP, the U0B86 code was identified, leading to a visual inspection revealing a faulty BCM.
Solution: Replaced the BCM and verified operation of all affected systems.
Cost: $650 (including parts and labor)
Result: All systems functioned correctly post-repair, and customer reported no further issues.
Case Study 2: Wiring Repair on a 2016 Ford Fusion
Vehicle: 2016 Ford Fusion, 40,000 miles
Problem: Reported issues with power windows and flickering dashboard lights.
Diagnosis: DTC U0B86 was retrieved, and a wiring inspection revealed corrosion at the BCM connector.
Solution: Repaired the damaged wiring and cleaned the connectors.
Cost: $200 (parts and labor)
Result: All electrical functions were restored, and the customer was satisfied with the repair.