The EMP pulse doesn't always cook the equipment. Frequently a cold boot will bring it back. Though I'm not sure how you'd do that for a car.
Maybe you can only use it at 2 am. Of course that unfairly privileges daytime people allowing them to get sufficient rest.
On the other hand maybe they'd shoot back and take out my net connection. *sigh* that whole cycle of violence thing.
Maybe if I want peace and quiet I should move underground.