> a warning message saying "check EV system"

These are some of the most annoying messages a piece of software can possibly display, and I hate them with a passion!

It's like this with a lot of commercial software, where designers don't want to scare users with complicated (useful) error messages, so you just get a "whoopsie! Something went wrong".

I'd much rather have an error message that I _don't_ understand over an error message I _can't_ understand.

In the case of cars, it used to be that a generic "Check engine" light showed up on your dash, and you needed an external tool to ask the computer what caused it to light up, but why would that be nessecary in a modern vehicle? You've got a large, high resolution display (or more!) on the CAN bus, why can't it show the full problem so you could take a picture right as it happens and send it to your dealer for instant diagnosis?

Even if the user error is opaque, why not log a short internal error to flash or the cloud?