Strange what happened

[big lo]

Wussup guys, this evening I was on my way to work and felt the car funny, I have 2007 at/Sedan just so that you know, and it felt if that the car was on low gear, but it was in drive, I pulled over to check the engine bay and nothing. When I turned the car on again the check engine light came on( I was like HOLY SH!T I need a transmission now) so I went a bit further and called the wife, to bring me some tools to verify. 10 mins later, she gave me the tools and I found nothing out of the ordinary. So what I did was unhooked the battery for 10 mins and then connected her again, check engine gone and the car was running normal, this is strange WTF happened here. Now yesterday I did wash my engine and I keep her clean never had this problem could this be the cause of it, really IDK, but she is running fine now, has any one ever gone through this or is this just some freak accident. I also for got to mention when the car was in drive the L gear was also on WTF, any idea guys?