B0057 is a body‑network (B) code indicating a fault in the seat‑belt buckle sensor circuit for the third‑row center seat. The restraints control module (RCM) detects an implausible signal (open, short, or out‑of‑range) and sets the code, often turning on the airbag/warning lights.
The sensor itself can suffer internal failure, creating an open or short circuit that the RCM interprets as a fault.
Chafed, pinched, or corroded wires in the sensor circuit can interrupt the signal or cause a short.
Bent, corroded, or poorly seated connector pins can prevent reliable electrical contact.
Non‑OEM seat covers or additional padding can physically interfere with the buckle sensor’s operation.
Rarely, the RCM may misinterpret the sensor data due to an internal electronics issue; this should be ruled out after checking the sensor and wiring.
No. B0057 relates to the seat‑belt sensor circuit, not the engine management system. The PCM is rarely involved; the fault is almost always in the sensor, wiring, or connectors.
Yes. The restraints system uses the seat‑belt buckle signal to decide airbag deployment; a fault in that circuit often triggers the airbag warning light.
The vehicle can be driven, but the seat‑belt reminder and possibly the airbag for that seat may not function correctly. The issue should be diagnosed and repaired promptly.
Yes. Non‑OEM covers or additional padding can press on or shield the buckle sensor, causing an implausible signal. Removing the cover may clear the code if no other fault exists.