DTC C1A27-12: Compressor Circuit - Circuit short to battery: 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 air suspension air supply unit isolation relay circuits for short circuit to ground. Repair circuit(s) as required, clear the DTCs and retest
Refer to the appropriate SYSTEM WIRING DIAGRAMS information and check the air suspension air supply unit isolation relay high current terminals for short circuit to one another. Repair circuit(s) as required, clear the DTCs and retest
If the fault persists, install a new air suspension air supply unit isolation relay. Clear the DTCs and retest
If fault persists, refer to the appropriate SYSTEM WIRING DIAGRAMS information and check the air suspension air supply unit isolation relay circuits and terminals for short circuit to ground. Repair circuit(s) as required, clear the DTCs and retest
If the fault persists, install a new air suspension air supply unit isolation relay. Clear the DTCs and retest