Code Definition

B2431 — Transponder Programming Failed

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

About B2431

B2431 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 B2431 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 immobilizer system uses a transponder embedded in the vehicle key to authenticate the key against a code stored in the immobilizer or body control module before allowing engine start. DTC B2431 sets when the immobilizer module attempts to program a new transponder, either during a key learning routine or at module replacement, and the programming sequence fails to complete successfully. The fault can arise from a missing or weak transponder signal, an unrecognized key type, an incorrect programming procedure, or a communication breakdown between the immobilizer antenna and the module. When...

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