B00C3Passenger Seat Occupant Classification Sensor D
- Generic OBD-II code · Body
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- 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
- RareInternal fault of sensor D or the classification module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.