Check Engine light came on, couldn't go past 4.5k rpms

Turned bike off and on then it worked fine. I was doing a small pull, probably in 2nd gear at 9k rpms on my CBR 600RR when my check engine light came on and I was rapidly decelerating. I pulled off to the side of the road and just wanted to see if I could make it home so I checked to see how fast I could go and it wasn't going past 4.5k rpms. The first thing I tried was to turn it off and turn it back on again. After I did this the bike ran fine my entire way home. Any thoughts on what could've happened.