B00C3 code meaning
Passenger Seat Occupant Classification Sensor D
What B00C3 means
B00C3 is the fourth passenger seat classification input. No carmaker documents it under this number. Some classification signals are not a weight at all but a frequency, which makes them prone to electrical noise. Tesla reported for 2017–2019 Model 3 cars that the OCS frequency could leave its valid range because of interference on the passenger seat harness, so the airbag symbol appeared on the touchscreen. The first fix added a harness extension with a ferrite filter at the OCS module, which sits under the front of the seat; a later bulletin used a dedicated filter module, each about 0.15 h of labour. Whether a maker files such a signal as D is not known. A stored B00C3 means this input is missing or out of range, and the airbag lamp stays on until the cause is found.
B00C3 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B00C3
- Airbag warning lamp or airbag symbol on the display
- Fault may depend on seat position or on other electrical loads being switched on
- Safety note: occupant classification unreliable; work on seat wiring only de-energised (12 V off, wait time), use the maker's filter or rework kit where one exists, specialist workshop only
Common causes of B00C3
- PossibleElectrical interference coupled into the seat harness (seat heating, motors, routing near other leads)
- PossibleHarness under tension or plug loose at the classification module when the seat moves
- Less likelyInternal fault of sensor D or the classification module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Passenger classification sensor dSRS seat wiringOccupant classification module
What each part of B00C3 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). |
| C3 | The exact fault in that area. |
What to do next
- Note B00C3 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 B00C3
What does B00C3 mean?
B00C3 means "Passenger Seat Occupant Classification Sensor D". B00C3 is the fourth passenger seat classification input. It is a generic code, so it means the same on every make.
Is it safe to drive with B00C3?
B00C3 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B00C3 fail an emissions test?
B00C3 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 B00C3 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will B00C3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.