B0050 code meaning
Driver Seat Belt Sensor
What B0050 means
B0050 monitors the switch in the driver's belt buckle that tells the restraint module whether the belt is latched; the module uses it for the belt reminder and for choosing the airbag and pretensioner response. Usually a two-wire Hall sensor whose current changes when the steel tongue enters the buckle. FCA documents B0050 with this wording: its 2016-17 parts notes for the Dart, Cherokee and Chrysler 200 list B0050-13 as an open circuit of the driver belt sensor, and TSB 10-001-23 for the 2015-22 Renegade and Fiat 500X lists B0050-13 and B0050-1D (out of range), traced to terminal corrosion at the inline buckle connector under the seat. Mitsubishi uses B0052 for the passenger buckle. The airbag lamp lights.
B0050 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 B0050
- Airbag warning lamp on
- Belt reminder for the driver may warn wrongly or stay silent
- Restraint module may treat the driver as unbelted and adapt airbag and pretensioner firing
- 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
Common causes of B0050
- Most likelyCorroded terminals at the inline connector between buckle and seat harness
- PossibleFaulty Hall sensor or switch inside the driver buckle
- PossibleBuckle lead pinched or stretched by the seat track
- Less likelyForeign object or debris in the buckle confusing the sensor
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 wiringSeat harness connectorSRS control module
What each part of B0050 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). |
| 50 | The exact fault in that area. |
What to do next
- Note B0050 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 B0050
What does B0050 mean?
B0050 means "Driver Seat Belt Sensor". B0050 monitors the switch in the driver's belt buckle that tells the restraint module whether the belt is latched; the module uses it for the belt reminder and for choosing the airbag and pretensioner response. It is a generic code, so it means the same on every make.
Is it safe to drive with B0050?
B0050 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0050 fail an emissions test?
B0050 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 B0050 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will B0050 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.