1st thing to do is erase the error code and see if it stays off. If not, what was the last thing you did? If it was to load the map, redo that. If it was the 12 minute tune, redo that. It may have just been a glitch. Sounds like a glitch that should go away with erasing the code tho. Did you do anything physical to it.
Also, come to think of it, since the plug for the tuneecu cable is under the side cover where the SAI solenoid also is, check the plug to the solenoid. You may well have knocked that off and that would certainly throw that very code. In fact, check this first.....seems like the likely reason since you were in there