Code Definition

B2139 — Data Mismatch (receive data does not match what was expected)

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

About B2139

B2139 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 B2139 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

DTC B2139 is set when one module on the vehicle network receives data from another module that does not match the value it was expecting. The fault is most commonly associated with the immobilizer or anti theft system, where the instrument cluster, immobilizer module, and powertrain control module must agree on a security identifier before the engine is allowed to start. When the received value disagrees with the stored expected value, the receiving module logs B2139. Symptoms typically include a no start or stall after start condition, the immobilizer warning lamp illuminated, and key relearn...

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