06 2500 deisel 10 days ago while driving lost all gauges.radio, ABS and security lights came and AC quit blowing cool. sometimes everything comes back on and sometimes just radio and voltmeter come back on, airbag, seatbelt, and brake light come on and go off. everything happens at random . engine light is ok. no messages on DIC and no codes.
replaced ign switch and removed after market security system. HELP its hot in Texas and I need my AC after working outside allday

 

buy an older chevy. their more reliable. less electronics. less stuff to fail.
but id take it to a dealer and have them look at it.

 

The dealer doesn't have a clue either . I called one dealer and explained the problem and they had no idea,
then took it to another and they couldn't find anything because it wasn't doing it when they checked it. I also tried justanswer.com and a GM tech said do a voltage drop at ign switch harness, thats when I replaced the ign switch. another GM tech said maybe its the passlock because they usually replace passlock when they replace the ign switch. I totally w/ older truck, my first truck was a '62 p/u I got in '81

 

or pull the cluster out and unplug everything, then plug it all back in and see what it does.

 

I use the old reliabale 2-70 A/C system in my truck more than the factory A/C system.