B2779 Code - Passenger Side Curtain Air Bag Module Circuit Short To Body Ground
Quick Answer
The B2779 diagnostic trouble code (DTC) indicates that there is a short circuit between the passenger side curtain airbag module and the body ground of the vehicle. Common causes include Damaged wiring or connectors leading to the passenger side curtain airbag module, Corrosion in the electrical connections, Faulty passenger side curtain airbag module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B2779 indicates Passenger Side Curtain Air Bag Module Circuit Short To Body Ground.
- Common causes
- Common causes include Damaged wiring or connectors leading to the passenger side curtain airbag module, Corrosion in the electrical connections, Faulty passenger side curtain airbag module.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code B2779 Description
The B2779 diagnostic trouble code (DTC) indicates that there is a short circuit between the passenger side curtain airbag module and the body ground of the vehicle. The passenger side curtain airbag is a crucial safety component that deploys in the event of a side impact or rollover to protect occupants from serious head injuries. When this circuit is shorted to ground, it can prevent the airbag from deploying properly in an accident, compromising the safety of the vehicle's occupants.
Common Causes of B2779
- Damaged wiring or connectors leading to the passenger side curtain airbag module
- Corrosion in the electrical connections
- Faulty passenger side curtain airbag module
- Impact or collision that may have damaged the airbag system
- Manufacturing defect in the airbag module or wiring
Symptoms of B2779
- Airbag warning light illuminated on the dashboard
- Inability to deploy the passenger side curtain airbag in a crash
- Fault codes related to the airbag system stored in the vehicle's computer
- Intermittent or non-functioning airbag system
How to Fix B2779
- Begin by disconnecting the vehicle's battery to prevent accidental deployment of the airbag system.
- Inspect the wiring and connectors leading to the passenger side curtain airbag module for any signs of damage or corrosion. Repair or replace any damaged components.
- Check the airbag module itself for faults. If necessary, replace the module with a new one.
- Clear the DTCs from the vehicle's computer using a diagnostic scan tool.
- Reconnect the battery and test the airbag system to ensure proper functionality.
Cost to Fix B2779
The cost of repairing a passenger side curtain airbag module circuit short to body ground can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of parts for this repair can range from $200 to $500, while labor costs can add an additional $100 to $300. Keep in mind that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the shop's labor rates. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate.
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Code B2779 Information for Specific Makes
- B2779 Lexus — Engine Starter Communication Malfunction
- B2779 Mazda — Passenger Side Curtain Air Bag Module Circuit Short To Body Ground
- B2779 Nissan — PTC Heater Communication
- B2779 Scion — Engine Starter Communication Malfunction
- B2779 Toyota — Engine Starter Communication Malfunction
Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B2779 Code
1. What are the common symptoms of OBDII code B2779?
- Common symptoms include the airbag warning light being illuminated on the dashboard, issues with the passenger side curtain airbag deployment, and a potential fault in the airbag system.
2. What causes the OBDII code B2779 to occur?
- This code is typically triggered by a short circuit between the passenger side curtain airbag module and the body ground, which can be caused by damaged wiring, faulty connectors, or a defective airbag module.
3. How can I diagnose the OBDII code B2779?
- Diagnosing this code usually involves using a professional OBDII scanner to retrieve the code, inspecting the wiring and connectors related to the passenger side curtain airbag module, and performing continuity tests to identify the location of the short circuit.
4. Is it safe to drive with OBDII code B2779 present?
- It is not recommended to drive with this code active, as it indicates a potential issue with the passenger side curtain airbag system, which may compromise its functionality in the event of a collision.
5. How can I repair OBDII code B2779?
- Repairing this code involves locating and repairing the short circuit between the passenger side curtain airbag module and the body ground. This may require repairing or replacing damaged wiring, connectors, or the airbag module itself.
6. Can I reset OBDII code B2779 without fixing the issue?
- While you can clear the code with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent potential safety risks associated with the passenger side curtain airbag system.
7. Are there any safety precautions to follow when working on OBDII code B2779?
- When working on the airbag system related to this code, it is essential to disconnect the vehicle's battery and wait for at least 10 minutes before starting any repairs to avoid accidental airbag deployment.
8. Can a DIY enthusiast fix OBDII code B2779 at home?
- While some DIY enthusiasts may have the skills to diagnose and repair this code, working on the airbag system can be dangerous. It is recommended to seek professional help to ensure the repair is done correctly and safely.
9. How much does it cost to repair OBDII code B2779 at a repair shop?
- The cost of repairing this code can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to get a diagnostic and repair quote from a reputable repair shop.
10. Will OBDII code B2779 cause my vehicle to fail an emissions test?
- This code is related to the passenger side curtain airbag system and should not impact your vehicle's emissions. However, it is still important to address the issue promptly to ensure the overall safety of the vehicle.
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