Quick Answer
C0B85 means: C0B85 indicates a malfunction in the Body Control Module (BCM)
Can I drive with C0B85? It's advisable to address this issue as soon as possible to prevent further complications.
Common Questions
What does C0B85 mean and how does it affect my car?
The C0B85 code indicates a malfunction with the Body Control Module (BCM), which manages several electrical systems in your car. This can lead to various issues, from malfunctioning lights to problems with the vehicle's security system. Addressing this promptly is crucial to avoid further complications.
What are the most common causes of C0B85 and how much does it cost to fix?
Common causes of the C0B85 code include a faulty BCM, wiring issues, and poor connections. Repair costs can vary, typically ranging from $100 for wiring repairs to $800 for a BCM replacement, depending on the complexity of the issue and labor costs.
Can I drive my car with C0B85 or should I stop immediately?
It's not recommended to drive your vehicle with the C0B85 code active. Doing so can lead to further electrical issues or even safety hazards. It's best to address this issue as soon as possible.
How can I diagnose C0B85 myself using GeekOBD APP?
To diagnose C0B85 using the GeekOBD APP, start by connecting the device to your vehicle’s OBD2 port. Use the app to scan for codes, focus on C0B85, and review freeze frame data to understand the context of the issue. The app can also guide you through possible causes based on the data retrieved.
What vehicles are most commonly affected by C0B85?
C0B85 is frequently found in Ford and Lincoln vehicles, particularly models like the 2013-2019 Ford Fusion and the 2015-2018 Lincoln MKC. It's advisable to check for any recalls or technical service bulletins (TSBs) related to the BCM for these vehicles.
How can I prevent C0B85 from happening again?
To prevent the C0B85 code from recurring, ensure regular maintenance checks on your vehicle's electrical systems. Keep connections clean and secure, avoid aftermarket modifications that may interfere with electrical systems, and consider using surge protectors for your vehicle’s electrical components.
What is C0B85?
The diagnostic trouble code (DTC) C0B85 indicates a malfunction in the Body Control Module (BCM) of your vehicle. The BCM is responsible for controlling various electrical systems in your car, including lighting, door locks, and security systems. When this code is triggered, it usually means that the BCM is not communicating properly with other modules in the vehicle or that it has detected an internal failure. This can lead to a variety of issues, such as malfunctioning lights, doors that won’t lock or unlock, and even problems with the vehicle’s security system. If you're experiencing symptoms associated with this code, it's essential to address the issue promptly. Ignoring it may result in more significant problems down the road, including potential safety hazards or complete loss of control over electrical functions. Commonly found in vehicles like the 2013-2019 Ford Fusion and the 2015-2018 Lincoln MKC, the C0B85 code can sometimes be accompanied by other codes, which can help pinpoint the exact problem. Diagnosing this code typically requires specialized equipment, like the GeekOBD APP, to retrieve additional information from the vehicle’s onboard computer.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0B85 is present:
- Check engine light remains illuminated, which can indicate various issues including BCM failure.
- Malfunctioning lights, such as headlights that flicker or don’t turn on, indicating potential electrical issues.
- Inability to lock or unlock doors remotely or manually, indicating a direct impact on vehicle security and convenience.
- Random electrical failures, like the dashboard lights flickering or losing power entirely, suggesting BCM communication issues.
- Unexpected vehicle alarms going off or security features not functioning, leading to potential safety concerns.
Possible Causes
Most common causes of C0B85 (ordered by frequency):
- Faulty Body Control Module (BCM) - the most common cause, with a likelihood of around 60%. This can result from age, wear, or environmental factors.
- Wiring issues - damaged or corroded wiring harnesses can disrupt signals to and from the BCM, accounting for about 25% of cases.
- Poor connections - loose or corroded connectors may prevent proper communication, making up roughly 10% of failures.
- Software glitches - sometimes the BCM can suffer from programming errors or bugs, which can be resolved with updates.
- External interference - aftermarket accessories or faulty modules can interfere with the BCM’s operation, though this is less common.
C0B85 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the faulty Body Control Module with a new unit.
- Total: $300 - $800
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring and connectors.
- Total: $100 - $300
- Success rate: 90%
Money-Saving Tips for C0B85
- 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 C0B85 Diagnosis Process
Follow these systematic steps to accurately diagnose C0B85. 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 a multimeter or specific diagnostic tools to test suspected components (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (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: 2016 Ford Fusion BCM Replacement
Vehicle: 2016 Ford Fusion, 75,000 miles
Problem: Customer reported that the vehicle's lights would intermittently flicker and the doors would not lock remotely.
Diagnosis: After running a diagnostic with the GeekOBD APP, the C0B85 code was confirmed along with other electrical fault codes.
Solution: The faulty Body Control Module was replaced, and wiring was inspected for damage. No additional issues were found.
Cost: $600 (including parts and labor)
Result: Post-repair road testing showed all electrical systems functioning normally.
Case Study 2: 2015 Lincoln MKC Wiring Repair
Vehicle: 2015 Lincoln MKC, 55,000 miles
Problem: Customer experienced complete failure of the alarm system and random electrical failures in the dashboard.
Diagnosis: Diagnostic scan revealed the C0B85 code. A thorough inspection uncovered corroded wiring in the BCM harness.
Solution: Damaged wiring was repaired, and connections were cleaned to ensure optimal communication.
Cost: $200
Result: All systems were restored to normal operation after repairs were completed.