Code Definition

B0065 — LHF seat belt pretensioner deployment loop circuit open

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

About B0065

B0065 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 B0065 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 B0065 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 B0065 sets when the Airbag Control Module (ACM) detects an open circuit in the Left Hand Front (LHF) 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 driver belt tight and locks it at the moment of a collision, so an open loop means the charge cannot receive the deployment signal. With B0065 stored the SRS warning lamp i...

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