Airbags

B00B0 — Driver Seat Occupant Classification Sensor A Fault

Severity: medium Safe to drive

What B00B0 means

B00B0 means the restraint control module detected a problem in the circuit or the unit of occupant classification sensor A in the driver seat. This system normally senses who is in the seat, and the module uses that to decide how airbags and pretensioners should deploy. When the signal can't be trusted, the module turns on the SRS light and may limit or disable some protection.

Symptoms

  • SRS or airbag warning light on or flashing
  • Driver seat occupancy reported incorrectly
  • Driver airbag disabled or running in a reduced mode
  • Code stored with no engine or transmission problems
  • Fault returns after being cleared

Possible causes

  1. Failed occupant classification sensor A in the driver seat
  2. Damaged or chafed wiring under the seat
  3. Corroded or poorly latched sensor connector
  4. Poor ground or power connection at the sensor module
  5. Communication fault or failed SRS module (uncommon)

How to diagnose

  1. Scan all modules with an SRS-capable tool and save the freeze-frame data
  2. Look for other airbag, belt or network codes and note them
  3. Inspect the harness and connectors under the driver seat for chafing, pinching by the rails, moisture or corrosion
  4. Make sure no foreign objects, wet seat covers or aftermarket heaters or pads are affecting the seat
  5. Test power, ground and signal circuits to the sensor against the factory wiring diagram
  6. Watch live sensor data with the seat empty and occupied
  7. Clear the code and see if it returns after wiggling the harness and a test drive

Common fixes

  • Repair damaged wiring or replace the connector
  • Clean the terminals and secure the connector
  • Replace the classification sensor or seat module, with calibration if required
  • Fix the communication fault or replace the SRS module if it's confirmed bad

Questions and answers

What does B00B0 mean?

It's a fault in driver seat occupant classification sensor A. The SRS module can't get reliable data on who is seated and may limit airbag operation.

Can I drive with B00B0?

Yes, the car drives normally. But the driver's restraints may not work correctly in a crash, so have it diagnosed soon.

Can I just clear B00B0?

You can, but if the cause is still there the code and SRS light will come back. Check the wiring, connectors and sensor first.

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.