Code Definition

B1B02 — Low frequency coil

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

About B1B02

B1B02 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.

When B1B02 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

B1B02 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 immobiliser system or Body Control Module (BCM) energises the low frequency (LF) coil antenna located around the ignition barrel or built into the start button assembly to transmit a 125 kHz LF signal that wakes and interrogates the transponder chip inside the key. The receiving module monitors current flow through the coil during the energising phase to verify the antenna is intact and operating correctly. DTC B1B02 is logged when the module detects an open circuit, a short to ground, a short to battery, or an abnormal current draw on the LF coil driver circuit, indicating the coil cannot...

Join TaT to view the complete code information and diagnostic details.

Quick Facts