Code Definition

B0072 (55) — LHF seat belt pretensioner structural malfunction

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

About B0072

B0072 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.

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 B0072 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

The airbag control module (ACM) sets DTC B0072:55 when it detects a structural or mechanical malfunction inside the Left Hand Front (LHF) seat belt pretensioner assembly rather than a simple wiring or resistance fault. The :55 sub code specifically indicates an internal fault, typically flagged when the pretensioner has already been deployed, when a stored ID or configuration mismatch is detected between the pretensioner and the ACM, or when the module receives feedback consistent with a physically damaged unit. Modern pretensioners can include an integrated status line or programmed identifie...

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