Code Definition

B1026 (87) — Steering lock unit communication with keyless entry module lost

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

About B1026

B1026 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.

B1026 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

On Mazda vehicles with push button start and an electric steering column lock, the Keyless Entry Module (KEM) communicates with the Steering Lock Unit (SLU) over a dedicated serial link or subnet to authenticate the key and command the column to lock or unlock. DTC B1026 (communication lost variant) sets when the KEM does not receive the expected cyclical response from the SLU within the required time window, either because the SLU has stopped responding or because the signal path between the two modules has been interrupted. The SLU is typically mounted on the steering column and powered from...

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