C0B20 - Understanding DTC C0B20: Common Issues in 2015-2019 Honda Accord and Other Models

Quick Answer

C0B20 means: C0B20 indicates an issue with the body control module's communication in your vehicle.

Fix: Check and replace faulty components Cost: $400 - $800 Time: 90-180 minutes

Can I drive with C0B20? Address this code as soon as possible to prevent further electrical issues.

Common Questions

What does C0B20 mean and how does it affect my car?

C0B20 indicates a malfunction in the body control module's communication system. This affects critical electrical features in your vehicle, like the lighting and locking systems, leading to potential safety and functionality issues. Addressing this fault promptly can prevent further electrical complications.

What are the most common causes of C0B20 and how much does it cost to fix?

The most common cause of C0B20 is a faulty body control module, with repair costs ranging from $400 to $800. Loose wiring connections can also be a problem, costing between $100 and $300 to fix. Regular maintenance and inspections can help prevent these issues.

Can I drive my car with C0B20 or should I stop immediately?

While you may be able to drive the vehicle, it's not advisable to ignore the C0B20 code. Continued operation could lead to failures in critical systems, making it unsafe. It's best to have the vehicle inspected as soon as possible.

How can I diagnose C0B20 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a full system scan to identify DTCs, including C0B20. The app will display freeze frame data, helping you understand the context of the fault. Additionally, it can assist in real-time monitoring of the vehicle's systems during diagnostic tests.

What vehicles are most commonly affected by C0B20?

This code is frequently observed in models such as the 2015-2019 Honda Accord and other vehicles equipped with advanced body control systems. Checking for recalls or Technical Service Bulletins (TSBs) related to these models can provide further insights.

How can I prevent C0B20 from happening again?

To prevent C0B20 from recurring, regular vehicle maintenance is crucial. This includes checking electrical connections for wear, keeping the BCM and wiring dry and clean, and updating the vehicle's software as needed. Being proactive can save you from costly repairs.

What is C0B20?

The diagnostic trouble code (DTC) C0B20 relates to a malfunction in the vehicle's body control module (BCM) or its associated systems. Specifically, this code indicates a fault in the communication between the BCM and other control modules, which can affect various components, including power windows, door locks, and lighting systems. In vehicles such as the 2015-2019 Honda Accord, this code may trigger warning lights on the dashboard and can lead to features like keyless entry or automatic door locks failing to operate correctly. The implications are not just limited to inconvenience; if left unaddressed, this issue may lead to more significant electrical problems or even a complete failure of the BCM, which is pivotal in managing multiple electrical systems in the vehicle. Car owners typically notice symptoms such as unresponsive controls or intermittent failures of electronic features. Immediate attention is essential to avoid further complications, as ignoring this code can lead to increased repair costs and potential safety issues if critical systems are affected.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0B20 is present:

  • The check engine light stays on constantly, indicating an ongoing issue that requires immediate attention.
  • Power windows may fail to operate, leading to difficulty in controlling cabin ventilation and comfort.
  • Central locking system may not respond, causing inconvenience and potential security concerns for the vehicle.
  • Dashboard warning lights may flicker or remain illuminated, providing unclear information about the status of various systems.
  • Intermittent failures of electronic accessories, such as headlights or interior lights, can lead to safety hazards.

Possible Causes

Most common causes of C0B20 (ordered by frequency):

  1. A faulty or failing body control module (BCM) is the most common cause of C0B20, with a likelihood of around 60%. This can happen due to age, exposure to moisture, or electrical surges.
  2. Loose or corroded wiring connections in the BCM harness can contribute to communication failures, accounting for about 25% of cases. Regular inspections can help identify these issues early.
  3. Software glitches or outdated firmware in the BCM may also trigger this code. Keeping your vehicle's software updated can prevent such occurrences.
  4. Less common causes include damaged circuit boards within the BCM, which can lead to costly repairs if not detected early.
  5. Rarely, issues with other related control modules can cause a C0B20 error, necessitating a more extensive diagnostic process.

C0B20 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing the body control module is often necessary if the BCM is confirmed faulty.

  • Total: $400 - $800
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring can resolve communication issues without replacing the BCM.

  • Total: $100 - $300
  • Success rate: 80%
Money-Saving Tips for C0B20
  • 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 C0B20 Diagnosis Process

Follow these systematic steps to accurately diagnose C0B20. 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).

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: 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).

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: 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).

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: 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).

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: 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).

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: 2017 Honda Accord BCM Replacement

Vehicle: 2017 Honda Accord, 45,000 miles

Problem: Customer reported that the power windows and keyless entry stopped functioning intermittently.

Diagnosis: Diagnostic scan revealed the C0B20 code, indicating a BCM communication issue. Visual inspection showed corrosion on the BCM connectors.

Solution: Replaced the body control module and cleaned the connectors. Updated BCM firmware to the latest version.

Cost: $650 (including parts and labor)

Result: Post-repair, all electronic functions operated normally, and customer reported no further issues.

Case Study 2: 2018 Honda CR-V Wiring Repair

Vehicle: 2018 Honda CR-V, 30,000 miles

Problem: Customer experienced intermittent dashboard warning lights and non-responsive central locking.

Diagnosis: Scan confirmed C0B20. Further inspection revealed a loose wiring connection in the BCM harness.

Solution: Tightened connections and repaired damaged wiring.

Cost: $150 (for labor and materials)

Result: After repair, all electrical functions worked correctly, and the warning lights ceased to appear.

Diagnose C0B20

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: C0B20
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes