Code Definition

B0072 (13) — LHF seat belt pretensioner squib Circuit open or resistance High

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 open (broken or disconnected) electrical path in the monitored circuit; and a signal or supply voltage higher 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 during a crash event. DTC B0072:13 sets when the measured circuit resistance is above the acceptable threshold or fully open, indicating either a broken conductor, an unmated connector, corroded terminals, or an open squib element. The pretensioner squib is a low resistance pyrotechnic igniter (typically around 2 ohms) that requires a controlled current pulse to fire, so any increase in circuit resistan...

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