Wire and switch locker mod

So I did the wire and switch anytime locker mod in my 09. I went and hit a trail today in the monsoon rain storm and I used 4 wheel hi with the locker engaged. All went well had some wheel spin and even got "Stopped" for a few seconds but worked thru and out of a sticky spot. I disengaged the locker then hit the switch and then hit the road in 2 wheel. The slippery light and the check engine light and abs light were on. I shut off the truck, checked the switch and restarted the truck. The abs light went out but the slippery and engine light stayed on. I unhooked the battery and everything reset. What in the hell? Did all this happen because I hit a speed when I was stopped? Trying to get out of a spot. I dunno but it is twice now this has happened.