Code Definition

B2103 — Antenna Not Connected

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

About B2103

B2103 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.

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 B2103 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 on vehicles equipped with an active or amplified antenna by checking the current draw from the antenna amplifier on the coaxial centre conductor. DTC B2103 is set when the receiver detects that no current is flowing through the antenna feed, indicating the antenna or its amplifier is not connected to the circuit. This can occur due to a broken antenna lead, a disconnected antenna at the base, or a failed amplifier that no longer draws current. When this code is set the driver will typically notice complete loss of AM a...

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