EMP Strike Starters and Alternators

I think starters and alternators will be fine for the most part.
And vehicle batteries almost certainly will be fine.

Delicate computer chips might get fried, or might need a simply power off/on cycle to recover them.

I think it is reasonable to get a spare ECM and other can-bus devices, get them programmed for your vehicle, then store in little galvanized steel ash can with foil tape on the seams.

If you search, there are a few threads on here going into more details by folks with more background in EMP than me. I think the consensus was that most vehicles will likely restart after an EMP if you disconnect the battery for a couple minutes, then reconnect.

It all depends upon your proximity to the EMP, and how much "antenna wire" is hooked onto your system that can collect EMP and conduct it to the semiconductors.

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EMP Strike Starters and Alternators