B0055 code meaning
Second Row Right Seat Belt Sensor
What B0055 means
B0055 stands for the buckle sensor of the right seat in the second row, behind the front passenger and in vans often beside the sliding door. Where that seat is a removable captain's chair, a disconnect in the buckle lead is unavoidable; IEE points out in a patent that a wireless buckle sensor alone cannot tell the module whether the seat is fitted, so a missing signal may mean a fault or simply an empty floor. A seat refitted with its plug left open is therefore a common trigger. CTS supplies non-contact Hall buckle switches for such uses. The rear belt warning of FMVSS 208, section S7.5(c), applies to this seat for vehicles made after 1 September 2028. No carmaker documents B0055 publicly; the Mitsubishi passenger code B0052 is the nearest documented model.
B0055 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0055
- Airbag or rear belt warning lamp on
- Right rear seat shown wrongly or missing in the belt status display
- Safety note: seat and buckle plugs under the seat lie near pretensioner and side airbag lines; only unplug them with the battery disconnected and the wait time observed
Common causes of B0055
- Most likelySeat connector not engaged after the removable seat was refitted
- PossibleCorroded buckle connector, e.g. from wet floor near the sliding door
- PossibleFaulty sensor in the right rear buckle
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat belt buckle switchSRS seat wiringSRS control module
What each part of B0055 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). |
| 55 | The exact fault in that area. |
What to do next
- Note B0055 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 B0055
What does B0055 mean?
B0055 means "Second Row Right Seat Belt Sensor". B0055 stands for the buckle sensor of the right seat in the second row, behind the front passenger and in vans often beside the sliding door. It is a generic code, so it means the same on every make.
Is it safe to drive with B0055?
B0055 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0055 fail an emissions test?
B0055 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 B0055 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will B0055 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.