Code Definition

B0043 — LHF seatbelt deployment loop Circuit malfunction

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

About B0043

B0043 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 B0043 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B0043 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 B0043 relates to the Left Hand Front (LHF) seatbelt pretensioner deployment loop, the firing circuit the Airbag Control Module (ACM) uses to trigger the pretensioner in a collision. The ACM monitors this loop by passing a small measuring current through it and watching the resistance, and it stores B0043 when it detects an open circuit, a short to ground, or a short to supply voltage that moves loop resistance outside the calibrated limits. Because the pretensioner is a single shot pyrotechnic device that tightens and locks the belt at the moment of impact, the firing circuit must stay wit...

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