Code B0125 appears in these brands
Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.
B0125
KrytycznyMalfunction in the seat belt buckle switch circuit (second circuit). The SRS system (passive restraint) has detected an irregularity in the belt buckle sensor.
Fault code B0125 indicates a problem with the seat belt buckle switch (second circuit). This means the passive restraint system (SRS) has detected a fault in the belt buckle sensor circuit, which may prevent the airbags from functioning correctly. To ensure safety, we recommend prompt diagnosis at a specialist workshop.
Symptoms
Flashing or steady airbag warning light; possible deactivation of the SRS system; lack of pretensioner operation; the check engine light may not come on, but the SRS light does.
Possible causes
Faulty switch in the seat belt buckle (passenger side) Broken or chafed wires in the switch circuit Contamination or corrosion in the buckle connector Faulty airbag control module (SRS ECU)
Affected systems
System SRS (Supplementary Restraint System)Pasy bezpieczeństwaWyłącznik klamry pasa
Does code B0125 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.