Not only that, you need electricity to handle key engine functions such as compression, fuel injection, etc. Can’t they make EMP insulated cars?
Well, Dad’s old yellow International truck seemed to function perfectly enough during solar storms, snow storms, hurricanes, droughts... :-D
The GPS system is much more sensitive to solar storms as the signal will get disrupted as it travels through the atmosphere. It would take a massive storm or burst to fry the electronics in the car - but yes, is still a concern.
I’m guessing that a driverless car doesn’t rely on GPS to stay in the proper lane - just to be able to navigate. So while it probably won’t mean a bunch of crashes, it probably would mean pulling over and stopping somewhere. (Hmm - I wonder if one can program a driverless car to “Go for a Country Drive.”)