B002A Fault Code Cause Diagnosis and Repair

What does the B002A fault code mean?

The B002A fault code, applicable to all car manufacturers, means “Right Curtain Deployment Control 2 (Subfault)“.

Background Information: Side airbags are mainly divided into two types: side trunk airbags and side curtain airbags. Side trunk airbags deploy from the seat or door panel to protect the occupant’s torso. Head protection comes from the extension of the side trunk airbag or from the overhead curtain airbag.

B002A Fault Code Symptoms:

• Airbag warning light illuminates
• airbag does not deploy
• DTC (Diagnostic Trouble Code) appears

Possible Causes of the B002A Code:

• Right Curtain Airbag Failure: The airbag itself may be defective or damaged.
• Wiring Problem: Short circuit, open circuit, or damaged wiring in the deployment control system.
• Airbag Module Failure: The module controlling the curtain airbag may be faulty.
• Sensor Failure: The sensor responsible for detecting a collision or impact may be faulty or miscalibrated.
• Airbag Control Module (ACM) Fault: The central module controlling all airbags in the vehicle may be malfunctioning.

B002A Fault Code Diagnostic Steps:

1. Scan DTCs (Diagnostic Trouble Codes): Use an OBD2 scanner to read relevant fault codes other than B002A. Check for other fault codes or communication faults in the airbag system.
2. Visual Inspection: Inspect the wiring and connectors of the airbag system. Inspect the curtain airbag and its right-side sensor to ensure there is no visible damage, such as wear or corrosion.
3. Check Previous Airbags: If the vehicle has been in an accident, check if the correct curtain airbag has deployed. Deployed airbags may need to be replaced, and the control system may also need to be reset.
4. Perform Functional Tests: Using diagnostic tools, sometimes system checks can be triggered to confirm the status of the correct curtain airbags, sensors, and deployment circuitry.
5. Check the Airbag Control Module: If a faulty airbag control module is found, it may need to be reset or replaced.

How to Repair B002A Fault Code:

• If the problem is wiring-related, repair or replace the damaged wiring or connectors.
• If the curtain airbag or inflator is faulty, the airbag or deployment circuit may need to be replaced.
• If the airbag control module is faulty, it may need to be reprogrammed or replaced.