The B0030 code indicates that the second‑row left side airbag system has failed to deploy properly during a crash. It is triggered when the airbag control unit detects a fault in the deployment control circuitry for that specific passenger side airbag.
The control module may have an internal fault or damaged circuitry that prevents proper deployment.
Loose, frayed, or severed wiring can interrupt the signal needed for deployment.
The sensor that monitors airbag status may be malfunctioning or its cable damaged.
If the airbag itself is bent, cracked, or not seated correctly, deployment will be inhibited.
In rare cases a fault in the engine control unit’s communication with the airbag system can trigger B0030, but this is much less common than hardware failures.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
While the PCM can occasionally trigger airbag fault codes, B0030 is almost always due to a hardware fault in the passenger side airbag control module, wiring, or airbag itself. A PCM replacement is rarely the correct solution.
The vehicle will still be operable, but the passenger side airbag will not deploy in a crash, reducing occupant protection on that side. It is recommended to have the fault addressed before driving.
Not necessarily. The code indicates a failure in deployment control; after repairing or replacing the faulty component, the airbag should function normally.