Code Definition

B10D7 (94-8A) — Key Unexpected Operation

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

About B10D7

B10D7 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.

B10D7 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) on Mazda vehicles manages the Passive Anti Theft System (PATS, also known on current Mazda platforms as the Advanced Keyless Entry and Push Button Start System or Immobiliser). The module communicates with the key transponder through the transceiver coil at the ignition lock (on traditional key vehicles) or the antenna modules around the cabin (on keyless models), and it expects a specific authentication sequence each time a key operation is detected. DTC B10D7 with Mazda subcode 94 8A indicates that the BCM has detected a key unexpected operation, meaning somethi...

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