Code Definition

B0058 — RHF seat belt pretensioner deployment loop Circuit open

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

About B0058

B0058 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 B0058 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 B0058 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 B0058 sets when the Airbag Control Module (ACM) detects an open circuit in the Right Hand Front (RHF) seat belt pretensioner deployment loop. The ACM passes a small monitoring current through the firing loop and measures its resistance, and an open or excessively high resistance loop drives the reading above the calibrated threshold, storing this open circuit fault. The pretensioner is a pyrotechnic device that pulls the passenger belt tight and locks it at the moment of a collision, so an open loop means the charge cannot receive the deployment signal. With B0058 stored the SRS warning la...

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