Code Definition

B0057 — RHF seat belt pretensioner deployment loop Circuit resistance low

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0057

B0057 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0057 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B0057 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC B0057 sets when the Airbag Control Module (ACM) measures a resistance in the Right Hand Front (RHF) seat belt pretensioner deployment loop that is lower than the specified range. The ACM passes a small monitoring current through the firing loop and watches its resistance, and a reading below the calibrated window points to a short between the loop conductors or a short to another circuit. The pretensioner is a pyrotechnic device that tightens and locks the passenger belt at the instant of a collision, so a low resistance loop can create an unintended firing risk or prevent a controlled dep...

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