I gotta ask: Has Anyone Done Homework On Which Vehicles Would Be Hardened Against EMP?
www.survivalblog.com has some information on makes models. He mostly recommends cars from about 1980 or earlier as I recall but thats only a guess.
Pretty much anything that doesn’t have electronic ignition or a computer. Numerous articles will explain which parts are at risk.
I haven’t researched harden vehicles. Plus, they are only good outside of the primary range a nuke-driven EMP. The defense dept., etc., have done lots of research on this type of stuff, so you can Google it.
As for resistant vehicles -— I doubt anyone has done that, except the military, maybe some preppers? Might find something on Google about that as well.
But I seriously doubt there are any truly hardened cars out there. You are probably good enough with the Gauss shields already in place to protect the outside from the inside of those boxes in your car. Beyond that, it will be costly, I suspect. Plus there is the testing aspect. Won’t know until you test those systems how effective they really are, and that will get expensive.
If you are really paranoid about it, you can buy several spares of all the sensitive components of your car, put them in a totally enclosed metal box, weld it, and bury it :)