Any vehicle with metal bodywork is a basic Faraday cage, and would survive an EMP with minimal damage to the engine control systems. Older vehicles that don’t have electronic ignition/fuel control systems would be completely unaffected.
https://en.wikipedia.org/wiki/Faraday_cage
So, you posit that glass windows will stop EMP?.
I have never heard that posited before.
Conventional wisdom is that any opening must be smaller than the waveform. Microwave ovens, with their metal screen enmeshed into the glass, are an example.