I just installed mine took it for a drive not out even 10 miles check engine light comes on. Called tec at afe told him what happend all he said was yah that happend to there test truck they can't figure out why .THey told me be best to take it back off to be safe. Going to send it back tomorrow.
I had the same problem with my afe until the latest reflash. When I first bought my truck Job 1 the kit worked great. Then I took it in for the first service and they reflashed my truck. THen the CEL lights started coming up. I now have 4k miles on the latest reflash and its great. Just need to get better mpg's.