B00B2 code meaning
Driver Seat Occupant Classification Sensor C
What B00B2 means
B00B2 is the third driver seat classification sensor in the J2012 list. No carmaker documents the code publicly. A widely used sensor type is Bosch's iBolt: the four bolts that anchor the seat frame are swapped for sensor bolts, a magnet and Hall element register how far a bending beam deflects, and the unit derives weight and how it is spread, separating an empty seat, a one-year-old, children of three and six, a 5th percentile woman and a 50th percentile man. A Bosch patent adds an accelerometer in the seat back that freezes the classification while jolts would distort the bolts' readings. Which bolt the letter C would denote is not published. With B00B2 stored, the airbag lamp is on and adaptive deployment cannot rely on that input.
B00B2 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B00B2
- Airbag warning lamp on
- Driver airbag cannot be matched to occupant size
- Safety note: airbag system; disconnect seat and sensor plugs only de-energised (ignition off, battery off, wait time); calibrate weight sensors after replacement, specialist workshop only
Common causes of B00B2
- PossibleInternal fault of the Hall-type sensor bolt at seat anchor C
- PossibleSensor bolt overloaded or seat frame bent, e.g. after a crash or wrong torque
- PossibleOpen or poor contact in the lead to input C
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Driver classification sensor cSRS seat wiringSRS control module
What each part of B00B2 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B2 | The exact fault in that area. |
What to do next
- Note B00B2 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B00B2
What does B00B2 mean?
B00B2 means "Driver Seat Occupant Classification Sensor C". B00B2 is the third driver seat classification sensor in the J2012 list. It is a generic code, so it means the same on every make.
Is it safe to drive with B00B2?
B00B2 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B00B2 fail an emissions test?
B00B2 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B00B2 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will B00B2 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.