02 Yukon 4x4 trouble....

[Chevyfan1984]

Ok I just bought an 02 Yukon 4x4. It has push button 4x4, 4 low, 4 high, 2 high and auto 4x4. I pressed the 4 hi to try the 4x4 and the light just flashed then went back to 2 hi. I hit 4 lo and heard it engage then the lights went out on the switch. Now the switch does nothing and the front diff is engaged. The transfercase is in high but I think 2 hi not 4 hi. I took out the 4wd fuse in the cab and also the atc fuse under the hood. Disconnected the battery for almost an hour today. Hooked it back up and the front is still engaged. My switches still do nothing.

[gmtech4]

Your encoder motor is likely finished , you need to pull codes out of the TCCM. To be sure , might be TCCM or switch , diag diag


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[Supreme Pizza]

A fine place to start: 

 

(Obviously you need to verify fitment prior to purchase) 

 

 

 

https://www.amazon.com/gp/product/B078HQF1Y5/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Edited July 9, 2018 by starman8tdc