Code Definition

B3123 — Keyless Entry Antenna System

System: Body  |  Type: Manufacturer-Specific  |  Make: Holden

About B3123

B3123 is a manufacturer-specific body diagnostic trouble code recorded for Holden vehicles. 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.

B3123 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) monitors the keyless entry antenna system to verify correct antenna operation and signal integrity for remote transmitter reception. DTC B3123 is set when the BCM detects an open circuit, short to ground, short to battery, or an implausible signal condition within the keyless entry antenna circuit. The antenna is what allows the BCM to receive the radio frequency messages from the remote transmitters, so a fault here degrades or prevents that reception. When this code is set the remotes may operate only at very short range or not at all, keyless functions may be u...

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