Hey guys I had something weird happen today. I hooked up my pro interface scanned my PCM as I normally do then I removed it as normal and went inside. About 20 minutes later I got out and start my truck and it shows the message "AC OFF" and has cut my a/c as if the thermostat or temp sensor went bad. BUT I am getting a good normal reading on the temp gauge and my thermostat is working fine, but it continues to show and my a/c won't kick on. Also there are no CEL's

Any Ideas as to what might have happened?

The truck is a 2007 Chevy Colorado 4wd 3.7L I5 auto