Zoeken
B0040
Systeem
Supplemental Restraint (Airbag)
Scanner vereist
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Occupant Classification System Malfunction

Understand B0040, common causes, and the right TOPDON scanner to diagnose it.

Passenger occupancy classification system fault — airbag may stay disabled incorrectly.

Veelvoorkomende symptomen

  • Passenger airbag off light always on
  • Airbag warning

Typische oorzaken

  • Occupancy mat in passenger seat
  • Seat cushion replaced without sensor
  • Connector under seat

Welke scanner heb je nodig?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen TOPDON scanners

Veelgestelde vragen

What does B0040 mean?
B0040 indicates occupant classification system malfunction. Passenger occupancy classification system fault — airbag may stay disabled incorrectly.
Can I diagnose B0040 with a basic code reader?
B0040 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for B0040?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B0040?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.