Code Definition

B0028 — RHF seatbelt deployment loop Circuit resistance low

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0028

B0028 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 B0028 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 B0028 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

DTC B0028 reports that the right hand front (RHF) seatbelt pretensioner deployment loop is reading a resistance below its normal range, as measured by the Restraints Control Module (RCM) during its continuous monitoring of the firing circuit. A pretensioner loop has a tightly specified resistance, so a low reading generally points to a short between the two deployment wires, a short to ground, or a pretensioner element that has degraded internally. Because reduced loop resistance alters the current path to the initiator, the RCM cannot guarantee correct or controlled deployment. While the code...

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