Before you go nuts and run to the dealer, try at least 2 restarts, then you can try a soft reset (hang up button 10 seconds) and then negative battery disconnect for 10 minutes.
It might resolve itself.
Last resort, head to dealer if light remains

 

Thanks !

 

I think the soft reset was the thin that worked. Thanks!

 

As long as it cleared, all is good.
Unfortunately, our trucks are prone to temporarily glitching idiot lights if the boot up doesn't run perfectly.
I've been lucky with my Gen3, but my Gen2 must have seen the check engine a few times, always cleared by the 2nd or 3rd restart.