I have a 2005 suburban 1500 Z71 with about 190,000mi. It is displaying a "service 4 wheel drive" message. The 4 wheel drive was working fine last year but i just went to use it and it wont do anything. I did some reading and decided to try the most inexpensive fixes first. I replaced the push button switch and cleaned the grounding wires under the truck. I also checked fuses and still nothing. I noticed that the lights on the switch come on at start up but then nothing is lit up after its started. Any suggestions are greatly appreciated. Thanks.

 

Check the sylanoid

 

Which solenoid?

 

They engage the 4 wheel drive in the transfer case

 

Check this thread out...
https://chevroletforum.com/forum/gen...95/#post312487