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

WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.

Refer to the appropriate SYSTEM WIRING DIAGRAMS information and check the integrity of the air suspension air supply unit main relay and associated wiring in the rear fuse box. Repair or replace as required, clear the DTCs and retest