B0349 - Understanding the Body Control Module (BCM) Malfunction in Honda and Toyota Vehicles

Quick Answer

B0349 means: B0349 indicates a problem with the Body Control Module, affecting various electronic components in your vehicle.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with B0349? Address this issue as soon as possible to prevent further electrical problems.

Common Questions

What does B0349 mean and how does it affect my car?

B0349 indicates a malfunction in the Body Control Module, which controls various electrical systems. This can lead to problems like non-working power windows or security issues, affecting your vehicle's overall functionality.

What are the most common causes of B0349 and how much does it cost to fix?

The most common causes include a faulty BCM, corroded connectors, or wiring issues. Repair costs can vary from $100 for minor wiring repairs to $800 for a BCM replacement, depending on the severity of the issue.

Can I drive my car with B0349 or should I stop immediately?

While you may be able to drive short distances, it is not advisable as the BCM controls critical systems. Continuing to drive could lead to further complications, including safety risks.

How can I diagnose B0349 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor the BCM's performance. This will help you identify whether the issue is with the BCM itself or related wiring.

What vehicles are most commonly affected by B0349?

Commonly affected vehicles include the 2007-2017 Honda Accord and the 2008-2016 Toyota Camry. It's advisable to check for any recalls or technical service bulletins (TSBs) related to the BCM for these models.

How can I prevent B0349 from happening again?

Regularly inspect your vehicle's wiring and connectors for corrosion or damage. Keeping the BCM dry and protected from moisture can also prevent future issues.

What is B0349?

The Diagnostic Trouble Code (DTC) B0349 refers to a malfunction in the Body Control Module (BCM) that is often associated with vehicles like the 2007-2017 Honda Accord, 2008-2016 Toyota Camry, and various models from both manufacturers. The BCM is a crucial component responsible for controlling various electronic systems in the vehicle, such as the power windows, door locks, and security systems. When the BCM detects an issue, it triggers the B0349 code, indicating a fault in its internal circuit or communication. This can lead to a range of electrical issues, such as malfunctioning lights, intermittent power door locks, or even problems with the vehicle's immobilizer system. For car owners, this can mean increased frustration and potential safety concerns, as these systems are essential for both convenience and security. Ignoring this code can lead to further complications, including the complete failure of key electronics. It's vital to address this issue promptly to ensure the safety and functionality of your vehicle.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0349 is present:

  • The 'Check Engine' light stays on constantly, indicating that the vehicle's computer is detecting an issue with the BCM.
  • Power windows or door locks become non-functional, making it difficult to access or operate the vehicle.
  • Interior lights flicker or do not turn on, suggesting communication issues within the BCM.
  • The vehicle may experience intermittent starting problems, which can leave you stranded if not addressed.
  • Security system malfunctions, such as the engine not starting due to the immobilizer being activated erroneously.

Possible Causes

Most common causes of B0349 (ordered by frequency):

  1. The most common cause is a faulty Body Control Module itself, with a likelihood of about 60%. This can happen due to wear and tear or water damage.
  2. Corroded connectors or damaged wiring leading to poor communication between the BCM and other components, accounting for around 25% of cases.
  3. Software issues or programming errors in the BCM can also trigger B0349, which may be resolved through a software update.
  4. Less common but serious causes include short circuits in the vehicle's electrical system, which can lead to extensive repairs if not detected early.
  5. A rare cause could be a malfunctioning ignition switch, which can prevent the BCM from receiving the correct signals.

B0349 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing the faulty Body Control Module with a new or remanufactured unit.

  • Total: $300 - $800
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors that affect BCM communication.

  • Total: $100 - $300
  • Success rate: 80%
Software Update

Performing a software update to correct any programming issues in the BCM.

  • Total: $50 - $150
  • Success rate: 70%
Money-Saving Tips for B0349
  • 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 B0349 Diagnosis Process

Follow these systematic steps to accurately diagnose B0349. 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 like the BCM and its connectors (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the BCM and its connectors (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 using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (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 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).

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: BCM Replacement on a 2010 Honda Accord

Vehicle: 2010 Honda Accord, 85,000 miles

Problem: Customer reported intermittent power window failure and dashboard lights flickering.

Diagnosis: Diagnostic scan revealed B0349, indicating a BCM malfunction. Visual inspection showed corrosion on BCM connectors.

Solution: Replaced the BCM and repaired the damaged connectors, followed by a software update.

Cost: $600

Result: Power windows and lights functioned normally after repair, and no further issues were reported.

Case Study 2: Wiring Repair on a 2015 Toyota Camry

Vehicle: 2015 Toyota Camry, 60,000 miles

Problem: Customer experienced issues with door locks and security system not recognizing the key fob.

Diagnosis: B0349 was found during the OBD2 scan, and visual inspection revealed damaged wiring harness near the BCM.

Solution: Repaired the damaged wiring and cleaned the BCM connectors.

Cost: $150

Result: All electrical systems operated correctly after the repair, customer satisfied.

Diagnose B0349

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: B0349
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes