Code Definition

B0072 (1C) — LHF seat belt pretensioner squib diagnostic circuit voltage 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.

When B0072 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 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) periodically applies a low level diagnostic voltage across the Left Hand Front (LHF) seat belt pretensioner squib circuit to confirm the pretensioner is ready to fire without triggering deployment. DTC B0072:1C sets when the voltage response measured back at the ACM does not match the expected pattern, typically because the diagnostic voltage is too high, too low, erratic, or absent altogether. This can be caused by unstable module supply voltage, a marginal ground, harness or connector faults that distort the measurement, or an internal fault in the squib itsel...

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