Need Help! Hummer gone nuts!

[Easy Ed]

My dash will look the same as what you have when I use the programmer. Unknown driver, service 4WD and the other lights, I will hear a couple click sounds from under the hood and also a "hiss" noise until it is finished.

Because of seeing that while messing with the program I guess I am thinking maybe a possible ECM or PCM (what ever it is called) problem has developed in your case ??

Hope ya figure it out, Ed