Several times, my 2019 Svartpilen 401 had a little trouble turning over on starting up, and sometimes returned a CAN EMS FAILURE warning message.
I had read on forums that maybe the electrical system of the Svartpilen 401 was a little underpowered, so I bought a battery trickle charger, and keep my Svartpilen on the charger while it is parked in my garage. Since doing this, the Svartpilen has started up right away every time and I have gotten no more error messages.
I use a ‘Foval 2 Amp Battery Charger’, bought through Amazon, and it seems to work, but I make no produce endorsements.