A mechanic friend advised me a few years ago, that the computers in today’s cars need a few seconds to wake up. He recommended turning the key to the “on position” to wake up the computer, counting to three or four Mississippis, then cranking the engine.
That’s what I do–well, really, I listen for three or four “bongs” coming from the “hey, put on your seat belt” warning. Either way, it seems to work. My car works well when I do that, and I don’t get weird or wonky error messages on the display. Once the engine is turning over, I can put on my seat belt and get going.