B0052: Passenger Seat Belt Sensor
The airbag module has detected a fault with the passenger seat belt sensor.
High risk
Have it checked soon. The seat belt reminder and airbag adjustment may not work correctly.
Short answer · Can I keep driving with B0052?
The car drives normally, but the seat belt reminder and airbag adjustment may not work correctly. Have it checked soon.
What does B0052 mean?
B0052 points to the sensor in the front passenger seat belt buckle. A faulty buckle switch or a loose plug under the seat are typical causes.
What the car does when the code is set
The airbag warning light comes on. The seat belt pretensioner or load limiter may not work in a crash.
How the system works
Seat belt pretensioners pull the belt tight in a crash, and load limiters release it slightly to reduce chest loads. The airbag module checks these circuits every time the car starts.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Connector under the seatMoving the seat can loosen or damage plugs under it.
- Damaged wiringWires under the seat can be pinched by the seat rails.
- Faulty buckle or sensorThe buckle switch or tension sensor can fail.
- Deployed pretensionerAfter a collision, pretensioners must be replaced.
- Airbag module faultPossible once wiring and parts have been checked.
How it is diagnosed
- Note the warning lightsAirbag and seat belt lights often come on together.
- Check under the seatLook for loose or damaged plugs and pinched wires.Do not unplug airbag or pretensioner connectors with the ignition on; this can deploy them or store more codes.
- Think about recent workSeat removal or carpet cleaning often disturbs these plugs.
- Have the restraint system testedA workshop reads the airbag module and measures the circuit.
Questions about B0052
Can a dirty buckle cause this code?
Sometimes. Dirt or a coin in the buckle can stop the switch from working.
Does the seat belt still work?
The belt itself usually still holds, but the pretensioner or load limiter may not work in a crash.