My Octavia Vrs facelift 2018 has had problems starting a few times. Everything it is after a rainy day so guess water is getting into somewhere it shouldn't.The battery voltage with the engine running is sometimes only 12.9v and sometimes 14.5v as normal. I think one of the relays is failing. Here is the obdeleven error codes. Can anyone help me?

Trouble codes:
        P065800 - Actuator Supply Voltage "A" Circuit Low
            Intermittent
        P068A00 - ECM/PCM Power Relay De-Energized Performance - Too Early
            Intermittent
        P056200 - System Voltage Low Voltage
            Intermittent

 

14 hours ago, Nanainmk said:

The battery voltage with the engine running is sometimes only 12.9v and sometimes 14.5v as normal.

That's perfectly normal for all Octavia 3's - it's the battery management system operating as designed to keep the battery state of charge to 80% to allow headroom for some minor regenerative braking.