This seems to be a general ‘bug’ as ours does the same on ‘high’? I wouldn’t bother bringing it to the dealer, just use the windscreen demist setting instead…
The 13.8V is supplied by the DC/DC section of CCU and is not indicative of the 12V battery health.
Starting the car with HV battery disconnected will ensure that all low voltage circuits are powered directly by the Aux battery.
If its voltage drops quickly below 12V consider replacing it...
Yes, the CCU will charge the 12V battery every time the HV battery is connected (READY or charging). What voltage does it show when READY?
You can try to do a HW reset, but most likely you’ll need to replace it.
The quality of the stock 12V battery isn’t great, hence the reason it’s only...
Every item not listed specifically is covered by the 7 year warranty e.g, the complete HV section (battery motor, inverter, CCU etc).
These are big tickets (££££) items to replace although unlikely to fail, is it worth the risk?
Your ‘home charger’ isn’t actually a charger but an EVSE. It just provides mains to the car’s internal charger (CCU) using simple analog technology.
Rapid DC CCS charging relies on a sophisticated two way communication protocol where a lot more can go wrong…
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