Code Definition

B0072 (12) — LHF seat belt pretensioner squib Circuit shorted to power

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 short-circuit (voltage pulled to ground or to supply) 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 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 and isolation from any external voltage source. DTC B0072:12 sets when the ACM detects battery voltage or another power source on one or both squib conductors, meaning the deployment circuit has an unintended path to a positive supply. The pretensioner squib is a low resistance pyrotechnic igniter (typically around 2 ohms) designed to fire only when the ACM commands it during a crash event, so any stray voltage across it can either trigger inadvertent deployment or cor...

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