4wheel drive will not engage, encoder?

Dose'nt switch from 2 wheel to 4 wheel, diagnosed at GM 4x4 controler still the same, no binding at selecter on tranfercase/ no power to encoder, need wireing diagram

My truck blows the ATC fuse as soon as you put it in. I unhooked the Transfer case motor and the fuse did not blow. Hooked it back up and blam blew. Ran a scan. With c0323 low voltage or smthn and a g1038 not sure what that one is. Do I need to replace the transfer case shift motor? Or the dash selector switch? Or look 4 smthn else?

Replaced Transfer case motor, stopped blowing the atc fuse, but now it will not come out of 4hi. Pull atc fuse and the front actuator will disengage the front, put it back in an the acuator engages the front. When you push the 2hi actuator and motor sound like there trying to engage but light blinks and goes back to 4hi. Removed Transfer case motor and could shift transfer case manually. Did I get a bad transfer case motor or is there something else to look for?

Put on another new TCM and a switch. Will shift from 4hi to 4lo to auto but still no 2high. Im trying to get a wiring diagram to look for some grounds maybe. Im puzzled.

Back again. Still stuck in 4hi. The control module behind the selctor switch in the dash. Do you know the part number or is it called anything besides control module and where can I buy one?

Yes we have scanned it and the dtc is c0323 the transfer case lock circuit low. I used the manual from the site u gave me and went through the ten step process it advised for that code and the only step we havn't done is replace that module. As step 9 recomends. How costly is this module and can I get it online? Any idea of part number? Are talking about a scan or a flash something gm has to do?

Hi, my 99 Suburban also blows transfer case fuse. Unplugging the 4 wire plug on the transfer case prevents fuse from blowing. I can leave 2 wire plug in TC and plug in front differential in place. Does this mean transfer case motor or less likely bad wire in harness?

Ken, the motor worked like a charm I plugged it in before taking down the old one and no blown fuse, confirming it wasn't a wiring harness issue causing short. Other than figuring out the stupid clamp on the rear boot, and how to get the boot off, it was a piece of cake. Easily less than an hour job. Fortunately the female on the motor was in the same position as the male shaft on the TC, I'm not sure how I would have gotten them to line up otherwise. Power the motor or spin the rear wheels?

I lost my 4WD. I tried to engage the 4WD by pushing the buttons on the 4WD switch. The lights on the switch would not light and the veh would not change from 2WD to 4WD. The service 4WD light came on in the instrument panel. I removed the battery cable to see if it would reset the code, the service 4WD lightwent out but there still appeares to be no power to the switch. I have replaced the actuator and the 4WD switch but I still appear to have no power to the switch. As stated above I can not engage the 4WD. Do you have any idea of the problem. Thanks

Hi. I have a z71 silverado with autotrac 4wd. I was driving in 4 hi when the trucked skidded to a halt. In 2wd the truck drives great. When I try to use 4wd, any auto hi or low the front wheels are locked up and the rear will do a burnout. Any ideas on what might be happening? I'm suspecting the encoder motor on the transfer case. Thanks