B0056Third Row Left Seat Belt Sensor
- Generic OBD-II code · Body
- How the car detects it
- B0056 belongs to the left third-row seat's buckle sensor, found in larger SUVs, minivans and seven-seat estates. Third-row seats usually fold flat into the floor, so the buckle lead has to pass through the folding mechanism and is flexed every time the cargo area is extended. In Ford's patent for rear belt monitoring the third-row bench is the hard-wired part of the system, while only the removable second row needs a wireless link. FMVSS 208 S7.5(c) extends the rear belt warning to all rear rows for vehicles built from September 2028. A Hall switch that senses the latched tongue is the usual hardware. No carmaker documents B0056 with this wording publicly, nor does any service bulletin mention it; Mitsubishi's B0052 is the documented model for this fault type.
- What you may notice
- Airbag or rear belt warning lamp on
- Fault may appear only with the third-row seat folded or raised
- Safety note: third-row buckle plugs can sit near pretensioner wiring; only unplug them with the battery disconnected and the wait time observed
- Likely causes
- LikelyBuckle lead broken or chafed in the fold-flat mechanism of the third row
- PossibleLoose or corroded connector at the third-row seat
- RareFaulty sensor in the left third-row buckle
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.