B0140Passenger Seatbelt Tension Sensor Circuit
- Generic OBD-II code · Body
- How the car detects it
- Neither the J2012 code lists available here nor any carmaker's public material contains B0140; its wording repeats B0061, the J2012 code for the front passenger belt tension sensor, and resembles B0182. The part itself is well described. In Delphi's design (US6554318B2) the webbing runs through a slider that moves against springs, while a Hall element between two magnets reads the travel. A second Delphi patent (US6605877B1) sends the tension value over a two-wire line to the module that classifies the occupant, which uses it to tell a tightly strapped child seat from an adult. FMVSS 208 allows automatic passenger airbag suppression for small occupants. A fault in this circuit usually lights the airbag lamp.
- What you may notice
- Airbag warning lamp on
- Passenger airbag status indicator may show an unexpected state
- Safety note: the sensor sits near pretensioner and side airbag plugs; unplug only with the battery disconnected and the wait time observed
- Likely causes
- LikelyLoose or corroded plug at the passenger belt tension sensor
- PossibleSensor signal out of range, for example from a jammed slider
- PossibleSensor lead trapped under the seat or at the sill panel
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.