Ok Guys, I am at a loss. I have a 05 Silverado Z71 Crew cab with about 87000, I've been having some 4x4 issues lately, like random service 4wd light and sometimes if I try and start and put it in gear to quick it starts off in 4L. I have an obdlink with ScanXL enhanced, so I plug it in and get a C0035 code. Ok no big deal I just changed the left hub a few months ago for bad bearings. So I take it back and exchange it under warranty Awesome. Drove it for a few hours here and there. And when I clear it while driving it stays away but when I turn off the ignition and turn it back on it trips the code again????? I don’t get it. Is there something I am missing? I did try the ground wires just a visual, and cleaned the ground where they attach to the frame. Anyone have some good pics or ideas of what else it can be? Hope someone can help

 

the selector switch went bad in my wifes Burb and locked it in low

 

Well I just had everything replaced less than a year ago. I dont think its the switch. I did take the whole wiring harness out from both sensors today. and they both checked good. But now I am getting both C0035 and C0040 on ignition only. When I start the truck and clear the codes they dont come back but as soon as I turn the ignition back to on they both come up in ScanXL Pro. I am Lost I dont see how taking the harness off the sensors and checking wires would cause them both to act up. I know the sensors are good I was monitering them while driving around the block and and they both give good speeds. So if someone has some tricks that would be great.

 

wiring? (looking around) who said that??? I don't have a clue I just know what happened to us. !!!