Why is my Check Engine light on?

[toller]

I know it can be for dozens of reasons, but given my circumstances, I wonder if anything jumps out at you. It is 2001 Grand Caravan AWD. It hasn't been driven for 6 weeks in wintery Western NY; light wasn't on then. It started right up today, but sounded pretty rough and the check engine light was on. As soon as I drove it, it seemed perfectly normal. I drove it a couple miles. Any obvious reasons this would happen? Thanks

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[bozzoswald]

probably a cylinder missfire cycle the the key on then off 3 times leaving the key on a p code will appear in the odometer google the p code for a description