Did you ever get a solution to this problem? Mine's doing the same thing and the GM Goodwrench On Demand Diagnostics who no codes or problems.
SOURCE: fix service stability
I had to replace my wheel bearings and sensor cable. The problem went away.
SOURCE: GMC Yukon XL is stuck in auto 4wd. Service 4wd
First get the codes from the transfer case control module.This will help in diagnosing the problem.You can try pushing the 2hi and 4lo buttons simultaneously for 10 seconds.This should put the transfer case in neutral. Then try going to 2 hi.See if this will get it out of 4wd.Let me know what you find.If you need more help let me know Good luck.
SOURCE: I have a 2005 gmc Yukon XL and it has been a great
First thing I would check is the wheel sensors. If yours are in the hub then lift the wheel and check for any play from top to bottom of the wheel. this will indicate a bearing going out. this can play havoc on the trac system. Also check the wiring of the sensors, unplug it and inspect the leads for corrosion. Check the wires for wearing against another part. Check the plug ends carefully the wires tend to start breaking right where they go in to the plug.
Randy
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Did you figure out what was wrong? My 2006 Yukon is doing the same thing, although not all of the time. Sometimes I start it and it will be stuck in 4Low, sometimes I start it and it's fine and then I will get a service 4wd message. Sometimes I will start it and no light shows up just the that the stability system is disabled and service 4wd. We were told we needed a part that was going to cost us $750.00. Hoping they've just misdiagnosed.
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