07 yukon "service 4wd" message

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john1978

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My 2007 Yukon message center says "service 4wd",,,The light on the indacator just blinks,,,I can hear the transfer case engage and when it does it locks the drive shaft in like it's supposed to,,But the front axle doesn't lock in,,I bought another actuator for the axle and plugged it in a selected "4wd" but the actuator didn't move,nor did the old one,,I'm thinking it needs a software update or perhaps a bad wiring harness,,,Any thoughts?
 
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07YukonSLT

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It may not help your specific issue but, I had a '00 Jimmy that had the same problem. It turned out to be the TCCM itself. The windshield had the infamous leak toward the bottom allowing water to run inside and drip on the TCCM. I don't even know where the TCCM is located on the GMT900s
 
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