B0051First Row Center Seat Belt Sensor
- Generic OBD-II code · Body
- How the car detects it
- B0051 belongs to the buckle sensor of a middle seat in the front row, found in pickups and vans with a front bench for three. FMVSS 208 requires a belt warning only for the outboard front seats, so a centre buckle sensor is extra equipment that feeds the restraint module and, where fitted, a reminder for that place. Typical hardware is a non-contacting Hall buckle switch as offered by CTS and described by Allegro. No carmaker documents B0051 with this meaning; Mitsubishi uses the same J2012 pattern for the passenger buckle, B0052, with an open or invalid signal for 2 seconds. Older GM modules (Saab 9-5 2006, 9-3) store B0051 as Deployment Commanded, a crash record. Airbag lamp on.
- What you may notice
- Airbag warning lamp on
- Centre seat belt reminder may be wrong or missing
- Safety note: the buckle connector sits under the seat next to the side airbag and pretensioner plugs; disconnect the battery and observe the wait time before unplugging anything
- Likely causes
- LikelyLoose or corroded connector of the centre buckle under the bench seat
- PossibleFaulty Hall switch in the centre buckle
- RareLead strained by a fold-down centre seat or console
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.