I've got a 2016 with about 50K miles. It suddenly stopped charging. When I plug in the charger, the blue dashboard lights flash for a few minutes & then go off.
I had it towed to the dealer and their diagnosis is that the 12V battery needs replacing. That's reasonably inexpensive, and at 5 years, expected for a lead acid battery. But I'm skeptical... seems like if the 12V battery fault could cause a charging problem with the lithium batteries, I'd be able to find it previously discussed on this forum.
Has anyone else encountered this?