Code Definition

B102B (51) — Keyless entry no advanced key programming record

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

About B102B

B102B is a manufacturer-specific body diagnostic trouble code recorded for Mazda 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.

B102B 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 Keyless Entry Module (KEM) on Mazda vehicles equipped with Advanced Keyless Entry stores the unique identification codes of each registered advanced key fob, allowing the system to recognise a valid key for passive entry and push button start operation. DTC B102B:51 is set when the KEM is queried for its stored key records and finds no valid advanced key ID programmed in memory, meaning the module has either never been taught a key or has lost its stored key data. The advanced key system uses low frequency antenna coils in the door handles and around the push button start to detect a nearb...

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