Since this thread is old I'll start anew.
I had my 2019 battery replaced June 20th 2022, and earlier this month (August 2022) received the High Voltage Charging System service message. Coolant reservoir was empty. Drove it to the dealer (228 miles). [Then went on a spectacular EV road trip...
Bought a 2020 salvaged bolt - good condition, but would like it serviced by someone that REALLY knows the car. Dealers claim they know it but some do and some don't. Anyone in LA or OC know of a good service place Dealer or Non-Dealer.
All help is greatly appreciated.