Code Definition

B2102 — Antenna Circuit Short to Ground

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

About B2102

B2102 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 B2102 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 B2102 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 radio receiver (audio control module) monitors the antenna feed circuit for proper continuity and resistance on vehicles equipped with an active or amplified antenna. DTC B2102 is set when the receiver detects that the antenna circuit is shorted to ground, typically by measuring the supply voltage delivered to the antenna amplifier through the coaxial centre conductor. The antenna circuit carries both the supply current to the antenna amplifier and the received RF signal back to the receiver on the same conductor. When this code is set the driver may notice poor or no radio reception on AM...

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