B00A0: Occupant Classification System
The airbag module has detected a fault in the occupant classification system.
High risk
Have it checked soon. The passenger airbag may be switched on or off wrongly.
Short answer · Can I keep driving with B00A0?
The car drives normally, but the passenger airbag may be switched on or off wrongly. Have it checked soon.
What does B00A0 mean?
B00A0 points to the system that detects who sits on the passenger seat. A sensor mat in the seat, its control unit and wiring are typical causes.
What the car does when the code is set
The airbag warning light comes on. The passenger airbag may be switched off wrongly or stay on when it should be off.
How the system works
The occupant classification system measures what sits on the passenger seat. It switches the passenger airbag off for a child seat and on for an adult.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Objects on the passenger seatBags or heavy items can confuse the system.
- Seat cover or cushionAftermarket covers can affect the sensor mat.
- Connector under the seatMoving the seat can loosen plugs.
- Faulty sensor mat or switchThe sensor in the seat can fail.
- Missing calibrationAfter repairs the sensor may need a zero-point calibration.
How it is diagnosed
- Clear the seatRemove objects and aftermarket covers, then restart the car.
- Check the passenger airbag indicatorIt shows whether the system has switched the passenger airbag on or off.
- Check under the seatLook for loose plugs and pinched wires.Do not unplug airbag connectors with the ignition on.
- Have the system calibratedA workshop tests the sensor and performs a zero-point calibration with an empty seat.
Questions about B00A0
Does a seat cover affect the system?
It can. Thick or heated aftermarket covers can disturb the sensor mat.
Why does the passenger airbag light show OFF?
The system switches the airbag off when it detects a child seat or a light occupant. With a fault, it may switch off for an adult too.