Car dead in garage with plenty of miles on it

[Oldrocky]

You can find an answer to this problem all over the internet. This is the reason why I always run a diagnostic on my car every month just to make sure that everything is in the right place.

Just saw this post. "Run a diagnostic" ... how do I do that? (New owner of 2018 Tesla here.) - Jim in Burlington, Wa.

 

[Occhis]

My question also. Does that mean check the voltage at battery, or something else?