I'm afraid this isn't an easy, black and white issue, though many ARE certain that most any EMP will fry modern society from top to bottom.
Fact is, of course, there's more we DON'T know about this scenario than what we do know. Variables such as size and type of the electronic/electrical pulse, proximity, and specific construction and make-up of various vehicles and appliances will go into determining end results.
So I can't give you a hard and fast answer. I've followed arguments between engineers and government employees who have been integral to the issue in tests Uncle Sam has conducted. Some say the danger is unproven and overblown.
Anyway, your question about a vehicle that may be advisable to have on hand for a worst-case EMP event ...
I suggest looking over this pretty comprehensive letter from a Survivalblog reader who likes older Chevy 4x4s: