Code Definition

B0072 (1A) — LHF seat belt pretensioner squib Circuit resistance low

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 a signal or supply voltage lower than the expected operating range.

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) monitors the Left Hand Front (LHF) seat belt pretensioner squib circuit for correct resistance so it can confirm the pretensioner is ready to fire when commanded. DTC B0072:1 sets when the measured circuit resistance falls below the acceptable window, indicating a partial short, a low resistance path in parallel with the squib, or an internally shorted turn in the squib element itself. The pretensioner squib is a low resistance pyrotechnic igniter (typically around 2 ohms) fired by a controlled current pulse, so an out of spec low reading can result in inadverte...

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