Code Definition

B2438 — Passengers Seat Belt Buckle Switch Circuit Short to Ground

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

About B2438

B2438 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 B2438 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 B2438 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 body control module monitors the front passenger seat belt buckle switch to determine whether the belt is latched or unlatched, supporting the seat belt warning chime and indicator and supplying belt status to the supplemental restraint and occupant classification systems on platforms where the passenger air bag deployment strategy depends on belt state. DTC B2438 is set when the module detects the passenger buckle switch signal input is held low at ground potential continuously rather than toggling between latched and unlatched states. Because the switch closes to ground when the belt is ...

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