Code Definition

B1C57 — Passive Start Ignition Relay Coil Circuit

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

About B1C57

B1C57 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 B1C57 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1C57 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) or Passive Start Control Module on Land Rover vehicles monitors the ignition relay coil control circuit to ensure correct electrical operation during keyless passive start and ignition requests. The passive start system authenticates the smart key and then commands the ignition relay coil to energise, supplying power to the ignition circuit. DTC B1C57 is set when the control module detects an electrical fault in the ignition relay coil circuit, such as an open circuit, short to ground, or short to battery, or when the commanded relay state does not match the expec...

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