humming sound when plugging in J1772 - NOT charging

[TonyWilliams]

Is there any way to check firmware version without taking the vehicle to the dealership?

Not that I'm aware of.

 

[fromport]

I'll bet you a nickel that the two cars have different firmware.

as suddenly as it started the (imo) weird behavior, it stopped doing that yesterday.
I checked voltage on the 12 volt battery, still the same voltage as when it started doing it.
Temperatures are roughly the same. Has been doing that that for 12 days and suddenly stops
Oh well, *magic* ;-)