I was in 4th rolling down a hill today when the check engine light came on and started blinking. I stopped the car and it eventually stopped blinking. The blinking lasted between 10-20 seconds total and in that time I didn't notice anything wrong. It's a '13 with only 600 miles on it and I haven't even driven it hard yet so I'm hoping it was a fluke issue. Any ideas as to what happened and if I should be concerned?