B0139 - Airbag Sensor Fault in Specific Vehicles Like Toyota and Honda

Quick Answer

B0139 means: B0139 indicates a fault in the passenger airbag sensor circuit.

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

Can I drive with B0139? Immediate attention is required to ensure airbag functionality.

Common Questions

What does B0139 mean and how does it affect my car?

The B0139 code indicates a problem with the passenger airbag sensor, which is crucial for airbag deployment during a crash. If this code appears, it could mean the airbag won't deploy as needed, posing a significant safety risk to passengers. Addressing this issue promptly ensures passenger safety during a collision.

What are the most common causes of B0139 and how much does it cost to fix?

Common causes include damaged wiring (60% likelihood) and a faulty passenger airbag sensor (25% likelihood). Repair costs typically range from $300 to $1500, depending on whether you need just a sensor replacement or a complete module replacement. Always consult with a qualified technician for accurate diagnosis and cost estimates.

Can I drive my car with B0139 or should I stop immediately?

It is advisable not to drive the vehicle if the B0139 code is active, as this indicates the passenger airbag may not deploy in an accident, significantly increasing the risk of injury. Immediate inspection and repairs are recommended.

How can I diagnose B0139 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan your vehicle's OBD2 system to retrieve trouble codes. Once you find B0139, review the freeze frame data to understand when the fault occurred. Look for any patterns, such as repeated occurrences after certain driving conditions, which can help you pinpoint the problem.

What vehicles are most commonly affected by B0139?

The B0139 code is frequently reported in vehicles such as the 2008-2014 Honda Accord, 2011-2016 Toyota Camry, and 2012-2015 Ford Focus. These models may have known issues with their airbag systems, leading to specific recalls or technical service bulletins (TSBs).

How can I prevent B0139 from happening again?

Regular maintenance of your vehicle's electrical systems and ensuring that no aftermarket modifications interfere with the airbag system can help prevent B0139 from reoccurring. Additionally, having your vehicle's airbag system inspected during routine check-ups can catch issues early.

What is B0139?

The diagnostic trouble code B0139 indicates a fault in the airbag system, specifically related to the passenger airbag sensor circuit. This code typically arises when the vehicle's onboard diagnostic system detects an open or short circuit in the wiring that communicates data from the passenger airbag sensor to the vehicle's central computer. This sensor is crucial for determining whether the airbag should deploy in the event of a collision. When the B0139 code is triggered, it could mean that the passenger airbag might not function correctly in a crash, posing a significant safety risk. Commonly seen in vehicles such as the 2008-2014 Honda Accord and 2011-2016 Toyota Camry, this issue can manifest due to damaged wiring, faulty connectors, or a defective sensor itself. Ignoring this code can lead to an inoperative airbag system, which is a severe safety concern. Therefore, it is essential for vehicle owners to address this issue promptly. The check engine light may illuminate on the dashboard, and drivers might also notice that the airbag warning light remains on or flashes intermittently. Taking immediate action is advised to ensure both driver and passenger safety.

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

Symptoms

Common symptoms when B0139 is present:

  • The airbag warning light remains illuminated on the dashboard, indicating a potential issue with the airbag system.
  • Inconsistent airbag deployment during test scenarios, leading to doubts about passenger safety in case of an accident.
  • Driver experiences issues with the passenger airbag light, such as it being stuck on or flashing unexpectedly.
  • In rare cases, the vehicle’s audio system may glitch or reset, indicating an electrical issue related to the airbag sensor.
  • Loss of other electronic functionalities, such as seatbelt reminders or passenger occupancy detection alerts.

Possible Causes

Most common causes of B0139 (ordered by frequency):

  1. The most common cause is damaged wiring or connectors, accounting for approximately 60% of B0139 cases. Poor connections can disrupt signal transmission to the airbag control module.
  2. A malfunctioning passenger airbag sensor itself can trigger this code, estimated at around 25%. This sensor can fail due to wear or manufacturing defects.
  3. Less commonly, the problem may stem from a software glitch within the vehicle's computer system, which can be fixed with a simple software update.
  4. A serious yet less frequent cause is a severe collision that may have damaged the airbag module and wiring, necessitating comprehensive repairs.
  5. Rarely, interference from aftermarket electronic devices or modifications can lead to false B0139 readings, particularly in vehicles modified for performance.

B0139 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair and Sensor Replacement

Repair damaged wiring and replace the faulty passenger airbag sensor.

  • Total: $300 - $800
  • Success rate: 85%
Complete Airbag Module Replacement

Replace the entire airbag control module if the issue persists after sensor replacement.

  • Total: $800 - $1500
  • Success rate: 90%
Money-Saving Tips for B0139
  • 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 B0139 Diagnosis Process

Follow these systematic steps to accurately diagnose B0139. 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 multimeter or specific diagnostic tools to test suspected components, including the passenger airbag sensor (20-30 minutes)

Step 3: Component testing - Use multimeter or specific diagnostic tools to test suspected components, including the passenger airbag sensor (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, ensuring all connections are secure and clear codes (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs, ensuring all connections are secure 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 and ensure no warning lights remain illuminated (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no warning lights remain illuminated (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: Passenger Airbag Sensor Replacement on 2013 Honda Accord

Vehicle: 2013 Honda Accord with 85,000 miles

Problem: Customer reported the airbag warning light was on and the check engine light was illuminated.

Diagnosis: Performed a diagnostic scan using GeekOBD APP, which revealed code B0139. Visual inspection showed damaged wiring near the sensor.

Solution: Replaced the damaged wiring and the passenger airbag sensor. Cleared the codes and performed a system function test.

Cost: $450 (parts: $250 for sensor, $200 for labor)

Result: The airbag warning light turned off, and the airbag system was restored to full functionality.

Case Study 2: Airbag Control Module Replacement on 2015 Toyota Camry

Vehicle: 2015 Toyota Camry with 60,000 miles

Problem: Customer noticed the airbag warning light was flashing intermittently.

Diagnosis: After scanning with GeekOBD APP, code B0139 was found. Further testing indicated a faulty airbag control module.

Solution: Replaced the airbag control module and reset the system. Conducted extensive testing to ensure proper operation.

Cost: $1200 (parts: $900 for module, $300 for labor)

Result: All airbag functions were verified, and the warning light was extinguished.

Diagnose B0139

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: B0139
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes