Code Definition

B3926 — Incorrect Immobiliser Identifier Received

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

About B3926

B3926 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.

B3926 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) or Theft Deterrent Module monitors the immobiliser identifier exchanged between authorised security system components during ignition on and start validation. DTC B3926 is set when an immobiliser identifier message is received that does not match the stored or expected identifier, indicating a security system identification mismatch that prevents successful authentication. The identifier is shared across the serial data network between the BCM, immobiliser, and engine controller, so a mismatch can stem from programming, data corruption, or communication faults. Wh...

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