DTC C1A27-29: Compressor Circuit - Signal invalid: Action

WARNING: This page is about a different car, the 2021 Land Rover Range Rover and 2020 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

Refer to the appropriate system wiring diagrams and check the integrity of the air suspension air supply unit main relay and associated wiring in the rear junction box. Repair or replace as required, clear the DTCs and retest