Quick Answer
C0C99 means: C0C99 indicates a communication issue within the vehicle's control modules.
Can I drive with C0C99? It is recommended to address this code as soon as possible to prevent further electrical issues.
Common Questions
What does C0C99 mean and how does it affect my car?
The C0C99 code signifies a communication issue within the vehicle's electronic systems, particularly involving the body control module (BCM). This can lead to several malfunctions, such as issues with power windows, dashboard lights, or even the HVAC system. If left unaddressed, it may cause more severe electrical failures, potentially affecting the overall safety and reliability of your vehicle.
What are the most common causes of C0C99 and how much does it cost to fix?
The primary causes of C0C99 include a faulty body control module (BCM), damaged wiring, and faulty sensors. Repair costs can vary significantly; replacing the BCM can range from $300 to $800, while wiring repairs may cost between $100 and $300. Software updates at dealerships typically cost between $150 and $300.
Can I drive my car with C0C99 or should I stop immediately?
While it may be possible to drive your car with the C0C99 code present, it is not advisable. The underlying electrical issues could lead to additional problems, including safety risks. It is best to have your vehicle diagnosed and repaired promptly.
How can I diagnose C0C99 myself using GeekOBD APP?
Using the GeekOBD APP, you can run a diagnostic scan on your vehicle's OBD2 system. This will allow you to retrieve the C0C99 code along with any other stored codes. The app can also provide freeze frame data, which shows the conditions when the fault occurred, helping you pinpoint the issue more effectively.
What vehicles are most commonly affected by C0C99?
Vehicles like the 2015-2018 Honda Civic, certain models of Ford Focus, and Chevrolet Malibu have been known to experience the C0C99 code. It's wise to check for any recalls or technical service bulletins (TSBs) related to these models that might address similar issues.
How can I prevent C0C99 from happening again?
To prevent the recurrence of C0C99, regular maintenance of your vehicle's electrical system is essential. This includes periodic inspections of wiring and connectors, keeping moisture away from electrical components, and having software updates performed at the dealership as necessary.
What is C0C99?
The Diagnostic Trouble Code (DTC) C0C99 indicates a fault within the vehicle's communication network, typically linked to the body control module (BCM) and other related systems. This code is an indication that the BCM has detected an issue that could affect various functions of your vehicle, including lighting, security systems, and comfort features. This code is often associated with models like the 2015-2018 Honda Civic, but it can appear in other vehicles equipped with a similar electronic architecture. When this code is triggered, it often leads to symptoms such as warning lights on the dashboard, inconsistent operation of electrical components, or even complete failure of systems like power windows or door locks. Ignoring the C0C99 code could lead to more significant electrical issues over time, which might require extensive repairs. As a vehicle owner, understanding this code and its implications can help you address potential problems early on, ensuring your vehicle operates safely and efficiently. Timely diagnosis and repair are crucial to avoid further complications that could arise if the underlying issues are not resolved.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0C99 is present:
- Check engine light stays on constantly, indicating a fault in the vehicle's communication system.
- Power windows may operate intermittently, leading to frustration during use.
- Dashboard warning lights for various systems (like ABS or traction control) illuminate unexpectedly.
- Malfunctioning door locks that may fail to respond to remote key fob commands.
- Inconsistent operation of the vehicle's air conditioning system, causing discomfort during drives.
Possible Causes
Most common causes of C0C99 (ordered by frequency):
- The most common cause is a faulty body control module (BCM), occurring in approximately 60% of cases. The BCM may fail due to exposure to moisture or electrical surges.
- Wiring issues, such as damaged or corroded connectors, can account for around 25% of C0C99 occurrences. These issues often arise from wear and tear or poor installation of aftermarket accessories.
- Faulty sensors or switches, which can lead to a miscommunication within the systems, may contribute to 10% of cases. Regular inspections can help prevent these issues by catching problems early.
- Less common but serious causes include software malfunctions within the BCM, which may require a reprogramming session at a dealership.
- Rarely, issues with the vehicle's main power supply or battery can trigger this code due to inadequate voltage reaching the BCM.
C0C99 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the faulty body control module with a new or refurbished unit.
- Total: $300 - $800
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors leading to the BCM.
- Total: $100 - $300
- Success rate: 75%
Software Update
Updating the BCM software at a dealership to resolve communication issues.
- Total: $150 - $300
- Success rate: 70%
Money-Saving Tips for C0C99
- 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 C0C99 Diagnosis Process
Follow these systematic steps to accurately diagnose C0C99. 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). Look for frayed wires or corrosion, particularly near the BCM.
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). This will provide insights into when the code triggered.
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). Check for proper voltage and ground signals at the BCM.
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). Ensure that all previously malfunctioning systems are now operational.
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes). Monitor for any returning symptoms or codes during the test.
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 2016 Honda Civic
Vehicle: 2016 Honda Civic, 45,000 miles
Problem: Customer reported intermittent dashboard warning lights and issues with power windows.
Diagnosis: After running a diagnostic scan, the C0C99 code was confirmed, indicating a fault in the BCM.
Solution: Replaced the faulty BCM with a new unit. Checked wiring and connections to ensure no further issues.
Cost: $650 (parts: $500, labor: $150)
Result: Post-repair, all electrical systems functioned correctly, and the customer reported satisfaction with the repair.
Case Study 2: Wiring Repair on 2017 Ford Focus
Vehicle: 2017 Ford Focus, 30,000 miles
Problem: Customer experienced issues with door locks and intermittent dashboard lights.
Diagnosis: C0C99 was retrieved as a fault code, leading to an inspection of the wiring harness.
Solution: Repaired damaged wiring and cleaned corroded connectors to restore communication.
Cost: $200 (parts: $50, labor: $150)
Result: Customer reported that all systems worked as intended after the repair, with no further issues.