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The immobilizer.
It could. A gray key does have a chip, a black key does not.
Yes
Yes
Yes.
Nope!!!
No there is no chip in the key however the ignition lock cylinder does enable and disable the theft system.
Yes it does.
If the key head is gray, yes. If the key head is black, no.
It could, the sentry key system was optional on a 2002 Chrysler Town and Country.
Yes, it has a chip. You can take the key to the Walmart auto section where they make keys. They can test it and tell you if it for sure has a chip but I am 99% sure it does.
There is a malfunction in the "chip" key system.