Airbags

B0002 — Driver Frontal Airbag Stage 2 Deployment Control Circuit Fault

Severity: high Drive with care, to a shop

What B0002 means

The SRS control module checks the airbag squib circuits every time the car starts. B0002 means it found a fault in the circuit for the second stage of the driver frontal airbag, such as an open, a short, out-of-range resistance, or a module problem. A dual-stage airbag deploys with different force depending on crash severity, so this fault can keep it from working correctly.

Symptoms

  • SRS or airbag warning light on
  • Possible airbag disabled message in the display
  • No change in engine or transmission performance
  • SRS light stays on after starting
  • Occasionally horn or steering wheel switches stop working

Possible causes

  1. Damaged wiring or connector in the airbag circuit
  2. Faulty clock spring (steering wheel spiral cable)
  3. Internal failure of the driver airbag module (inflator/squib)
  4. Poor connection at the connectors under the seat or at the steering column
  5. Low supply voltage or a poor ground
  6. Software fault or failure in the SRS control module

How to diagnose

  1. Scan all modules with an SRS-capable tool, record the data, and look for other airbag codes
  2. Inspect connectors under the seat and at the steering column for corrosion, bent pins, and loose locks
  3. Check battery voltage and the SRS module ground
  4. Disconnect the battery and wait the time specified by the manufacturer so the backup capacitors discharge
  5. Test circuit resistance and the clock spring using service data; never probe an airbag with an ordinary multimeter
  6. Use the manufacturer's method or a proper simulator to see whether the code changes
  7. Check the harness for opens and shorts to ground or power
  8. After repair, clear the code and confirm it does not return

Common fixes

  • Repair the wiring or replace damaged connectors
  • Replace the clock spring
  • Replace the driver airbag module
  • Reprogram or replace the SRS control module

Questions and answers

What does B0002 mean?

It is a fault in the control circuit for the second stage of the driver frontal airbag. The SRS module sees an abnormal reading in the squib circuit and turns on the warning light.

Can I repair an airbag myself?

Reading codes and visually checking connectors is fine, but working on the airbag or clock spring risks accidental deployment. Disconnect the battery and follow the manufacturer's procedure, or have a shop do it.

Why is the SRS light on when the car drives fine?

The SRS is separate from the engine and transmission. The fault affects only crash protection, so driving feels normal, but the airbag may not deploy as intended.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.