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2006 GMC Sierra Auto Transfer Case Issue #4115922 06/05/16 02:47 PM
Joined: Feb 2008
Posts: 386
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marc1 Offline OP
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Joined: Feb 2008
Posts: 386
Hi,

2006 GMC (see signature) my wife drives it 90% of the time for errands. Quite a while ago (easily over a year ago) she had an incident and reported it was behaving as if it was in 4wd (she was on dry pavement, summer conditions etc.) while in the 2wd mode. I checked it out when she got back and could not repeat the issue. I noted it and that was it.

Today I was out running errands and as I swung wide into a parking stall, the drivetrain started bucking, the turn was clearly binding and the truck started behaving as if it was in 4wd on dry pavement again. I triple checked the buttons, 2wd was lit and I was sure I didn't nudge it while driving. I ran in to the store to complete the errand and came back out to deal with the problem. But it was gone. I cycled the transfer case through all the modes and then back to 2wd. Drove home and nothing was amiss.

96k (kms so about 60k miles) on the vehicle, the AutoTrak fluid was replaced at 80k (kms so 50k miles) with genuine GM AutoTrak. Truck is in mint condition and well maintained. This is my first "auto" t-case does anybody have any idea where to start looking for sensors etc. that might be commanding 4wd when I haven't pressed the button? Has anyone had this exact issue? I never use the auto feature, I don't like it and now it appears I am suffering with an option I didn't want / like anyway. cry

I will start with the obvious, checking grounds, connections etc.

Thanks,

Marc


2017 Tacoma SR5 4WD 24k km M1 EP 0w20 M1 EP Filter

Gone but not forgotten:
1970 Chevelle SS454 LS6
1970 GTO Judge RAIV
1968 GTO
1968 GS400
2011 Shelby GT500
Re: 2006 GMC Sierra Auto Transfer Case Issue [Re: marc1] #4116007 06/05/16 03:43 PM
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Doog Offline
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Do you have all 4 same tire sizes on the truck? If so, are some more worn than others?

Last edited by Doog; 06/05/16 03:44 PM.
Re: 2006 GMC Sierra Auto Transfer Case Issue [Re: Doog] #4116042 06/05/16 04:10 PM
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marc1 Offline OP
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Originally Posted By: Doog
Do you have all 4 same tire sizes on the truck? If so, are some more worn than others?


Identical, same tread depth. The issue would not be intermittent if the tires were sized wrong nor would different tire sizes matter if the unit stayed in 2wd.


2017 Tacoma SR5 4WD 24k km M1 EP 0w20 M1 EP Filter

Gone but not forgotten:
1970 Chevelle SS454 LS6
1970 GTO Judge RAIV
1968 GTO
1968 GS400
2011 Shelby GT500
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