B0859 - Driver Airbag Circuit Malfunction (Common in 2006-2012 Ford Fusion and 2008-2013 Honda Accord)

Quick Answer

B0859 means: B0859 indicates a driver airbag circuit malfunction, affecting airbag deployment.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with B0859? Immediate attention is required to ensure airbag functionality.

Common Questions

What does B0859 mean and how does it affect my car?

The B0859 code indicates a malfunction in the driver airbag circuit, which can prevent the airbag from deploying during a collision. This poses a serious safety risk, as it compromises the effectiveness of the airbag system, potentially increasing the likelihood of injury in an accident.

What are the most common causes of B0859 and how much does it cost to fix?

Common causes of B0859 include wiring issues, faulty airbag modules, and poor connections. Repair costs can range from $150 for simple wiring repairs to $700 for airbag module replacements, depending on the specific issue and vehicle make.

Can I drive my car with B0859 or should I stop immediately?

It's not safe to drive your vehicle with a B0859 code active. The airbag system may not deploy in an accident, increasing the risk of injury. It’s best to have the issue diagnosed and repaired before operating the vehicle.

How can I diagnose B0859 myself using GeekOBD APP?

To diagnose B0859 using the GeekOBD APP, first, connect the app to your vehicle’s OBD2 port. Run a full system scan and check for B0859 and any related codes. Pay attention to freeze frame data for context and focus on wiring and connectors in the airbag system.

What vehicles are most commonly affected by B0859?

B0859 is frequently reported in models like the 2006-2012 Ford Fusion and the 2008-2013 Honda Accord, among others. It's important to check for any recalls or TSBs related to airbag systems for these vehicles.

How can I prevent B0859 from happening again?

Preventive measures include regular inspections of the airbag system, ensuring that all wiring is intact and connections are secure, and addressing any electrical issues promptly. Keeping the vehicle clean and free of moisture can also help prevent corrosion.

What is B0859?

The diagnostic trouble code B0859 indicates a malfunction in the driver airbag circuit. This code is related to the vehicle's airbag system, specifically the circuits that control the deployment of the driver’s airbag. When this code is triggered, it typically means that the airbag system has detected a fault in the wiring or components associated with the driver airbag. This can prevent the airbag from deploying in the event of a collision, significantly increasing the risk of injury. Common symptoms associated with this code include the illumination of the airbag warning light on the dashboard and potential issues with the airbag not functioning correctly during a collision. It's important to address this issue promptly, as airbag malfunctions can compromise vehicle safety. In many cases, the problem can stem from broken or frayed wires, a faulty airbag module, or issues with the airbag itself. If you see the B0859 code, it's advisable to have the vehicle diagnosed by a professional to ensure the integrity of your airbag system and your safety on the road.

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

Symptoms

Common symptoms when B0859 is present:

  • The airbag warning light is illuminated continuously on the dashboard, indicating a malfunction in the airbag system.
  • Intermittent airbag deployment issues may arise, which could prevent the airbag from deploying in an accident.
  • Increased difficulty in starting the vehicle, as some systems may disable the engine due to the airbag fault.
  • Strange noises from the steering column area, such as clicking or popping sounds, which may indicate wiring issues.
  • In some cases, the vehicle may exhibit electrical malfunction symptoms, such as erratic behavior of other electronic components.

Possible Causes

Most common causes of B0859 (ordered by frequency):

  1. Wiring issues are the most common cause of code B0859, with a likelihood of about 60%. Frayed or damaged wires in the airbag circuit can lead to a loss of connectivity and trigger the code.
  2. A faulty airbag module is another common culprit, accounting for around 25% of cases. If the module itself is malfunctioning, it may not send the proper signals to the airbag.
  3. Poor connections at the airbag terminals can also cause this code, with a 10% likelihood. Corrosion or loose connectors can disrupt the electrical flow needed for proper operation.
  4. Less common but serious causes include a malfunctioning clock spring, which is responsible for maintaining the electrical connection between the steering wheel and the vehicle's electrical systems.
  5. A rare cause could be a problem with the vehicle's body control module, which may malfunction and affect multiple systems, including the airbag.

B0859 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring in the airbag circuit.

  • Total: $150 - $400
  • Success rate: 85%
Airbag Module Replacement

Replace the faulty airbag module if it's not functioning properly.

  • Total: $300 - $700
  • Success rate: 90%
Clock Spring Replacement

Replace the clock spring if it is causing the airbag malfunction.

  • Total: $200 - $500
  • Success rate: 80%
Money-Saving Tips for B0859
  • 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 B0859 Diagnosis Process

Follow these systematic steps to accurately diagnose B0859. 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 that could affect the airbag circuit (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion that could affect the airbag circuit (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, which helps in pinpointing the issue (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, which helps in pinpointing the issue (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 to test the airbag circuit and verify continuity and voltage, focusing on wires and connectors (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the airbag circuit and verify continuity and voltage, focusing on wires and 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 - After addressing any issues found, verify proper operation of the airbag system and clear codes with the GeekOBD APP (10-15 minutes)

Step 4: System function test - After addressing any issues found, verify proper operation of the airbag system and clear codes with 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 the vehicle under various conditions to confirm the repair success and ensure the airbag system is functioning correctly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair success and ensure the airbag system is functioning correctly (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: Driver Airbag Circuit Repair on 2010 Ford Fusion

Vehicle: 2010 Ford Fusion, 85,000 miles

Problem: Customer reported the airbag warning light was on, and there were concerns about airbag deployment during an accident.

Diagnosis: Diagnostic scan revealed code B0859. Visual inspection showed damaged wiring near the airbag connector.

Solution: Repaired the damaged wiring and secured all connections. Cleared the code and confirmed proper airbag functionality.

Cost: $250 (wiring repair and diagnostic fee)

Result: Airbag system functioning correctly with no further issues reported.

Case Study 2: Airbag Module Replacement on 2009 Honda Accord

Vehicle: 2009 Honda Accord, 70,000 miles

Problem: Customer experienced intermittent airbag deployment issues and the airbag light was illuminated.

Diagnosis: OBD2 scan confirmed code B0859; further testing indicated a malfunctioning airbag module.

Solution: Replaced the airbag module and performed system tests to ensure functionality.

Cost: $600 (airbag module and labor)

Result: Post-repair tests showed all systems were operational, and the customer reported satisfaction.

Diagnose B0859

Use GeekOBD APP for professional diagnosis!

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  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B0859
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes