What it means
This code identifies a fault associated with the driver seat belt sensor. The restraint control module sets it when it detects a problem with this sensor; the specific fault is identified by accompanying subfault information.
How it works
The driver seat-belt sensor reports the driver's belt status to the restraint control module. The module monitors the sensor and its circuit for an electrical or status fault; the accompanying subfault information is needed to identify the exact failure.
Common causes
Most likely first.
- Damaged seat belt sensor wiring or connector
- Faulty seat belt sensor
- Seat belt buckle or latch fault
- Restraint control module fault
Symptoms
- Airbag warning light on
- Seat belt warning may stay on
- Seat belt status may be misreported
How to diagnose it
- Use a scan tool that can read restraint-system codes to record the B0050 subfault and freeze-frame data before clearing anything.
- With the vehicle parked, check whether the driver belt latches and releases normally and whether the warning changes with the belt status.
- Inspect the driver buckle sensor connector and nearby wiring for looseness, corrosion, pin damage, or chafing.
- Compare scan-tool driver belt-status data while latching and unlatching the belt to see whether the sensor signal changes reliably.
- Test the driver sensor circuit and buckle sensor using the manufacturer's diagnostic procedure, then consider the restraint control module only if the circuit and sensor pass.
Common fixes
- Reconnect or repair damaged wiring at the driver buckle sensor.
- Clean or repair corroded or damaged connector terminals.
- Replace the faulty driver seat-belt sensor or buckle assembly as specified for the vehicle.
- Repair or replace the restraint control module only after its power, ground, wiring, and sensor inputs are verified.
Can I keep driving?
The vehicle may remain driveable, but the airbag warning indicates the restraint system may not work as designed in a crash. Make sure the driver belt latches securely and arrange diagnosis promptly; do not rely on the warning light alone to confirm protection.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.