Code Definition

B2123 — Passenger Side Satellite Communication Circuit Short to Ground

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

About B2123

B2123 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 B2123 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 B2123 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

B2123 is set when the passenger side satellite impact sensor or its communication circuit is detected by the airbag control module as being shorted to chassis ground. Satellite sensors are remote impact sensors mounted at strategic points around the vehicle, typically in the body pillars, doors, or front rail areas, that communicate crash event data back to the airbag control module via a dedicated serial communication line. The airbag control module continuously monitors the integrity of these communication circuits, and when it detects that the signal line is shorted to chassis ground rather...

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