Code Definition

B1B01 (87) — Key transponder — Bus signal/message failure — missing a message

System: Body  |  Type: Manufacturer-Specific  |  Make: Land Rover

About B1B01

B1B01 is a manufacturer-specific body diagnostic trouble code recorded for Land Rover 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.

B1B01 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 vehicle security and immobiliser module (the BCM, the engine management module, or a dedicated PATS module depending on platform) monitors transponder identification messages on the vehicle data bus, which is CAN on most Land Rover models. When the driver attempts to unlock, wake the vehicle, or crank the engine, the immobiliser reader interrogates the key transponder, then broadcasts the resulting identification message onto the bus so the engine management module can authorise starting. DTC B1B01:87 is set when the receiving module expects a specific transponder identification or keep al...

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