Aircon DTC help request

I have a climatronic problem where the aircon seldom works and when it does it's not as cold as it could be.

System was regassed with no leaks detected.

I have always suspected a sticky compressor solenoid valve (N280?).

I scanned things recently and need assistance with where to look regarding the DTCs:

18043 - CAN, engine/AC communication; missing or faulty signal - Intermittent

01320 - Climate control - no communication - Intermittent

I suspect a bad wiring but am not sure where to check.

If it's any help, hard cornering quite often gets the aircon going!