B0072 is a diagnostic trouble code (DTC) for the passenger seat belt pretensioner deployment control circuit. It indicates that the airbag system has detected a fault in the circuit that controls the deployment of the passenger-side seat belt pretensioner, which tightens the belt during a collision.
The pretensioner itself is the most common failure point. Internal short or open circuit in the pretensioner unit prevents proper deployment control.
Wiring harness or connector issues between the pretensioner and the SRS module, such as broken wires, corrosion, or poor pin contact, can cause the code.
Less commonly, the SRS module itself may have an internal fault affecting the pretensioner deployment control circuit. This is a lower-probability cause.
A blown fuse in the SRS system or a loss of power/ground to the pretensioner circuit can trigger the code.
If the pretensioner was previously deployed in a crash and not properly replaced, or if wiring was damaged during repair, the code may set.
No. B0072 is a body code related to the Supplemental Restraint System (SRS). The powertrain control module (PCM/ECM) does not control the seat belt pretensioner. Replacing the PCM will not fix this code.
The vehicle may still be drivable, but the passenger seat belt pretensioner will not deploy in a crash, increasing injury risk. The airbag system may also be compromised. It is recommended to have the issue diagnosed and repaired promptly.
Often yes, because the pretensioner is integrated into the seat belt retractor and is not serviceable separately. However, always confirm with the vehicle's service manual, as some designs allow replacement of just the pretensioner unit.
No. Once a pretensioner has deployed, it must be replaced. Attempting to reset or reuse it is dangerous and will not restore proper function.