Stuck in Auto4wd

dubfreaks · May 26, 2017

So I already knew that it didn't want to come out of 2wd when I noticed it refused to shift into 4L and 4H, however I do not need to use anything but 2wd until the winter time so I wasn't to concerned for now. Yesterday, when installing a radio I accidentally hit the Auto4wd button and now it's stuck there. I managed to get it into 2wd after numerous button pushes, but after I shut it off and start it up again... back in Auto4wd.

My question is when I finally get it back into 2wd is there a quick solution to keep it there until I'm ready to fix the overall issue?

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mizzouguy · May 26, 2017

How long has it been since you changed the auto-trac 2 fluid? When it gets old it can cause issues going into and out of 4wd. I had one time also where I went though a car wash and the switch was blinking in neutral...scary. I pulled the fuse and put it back in after a few minutes and it seemed to reset it. Hope this helps.

dubfreaks · May 26, 2017

Good stuff, I was thinking of after it switched back into 2wd just yank the fuse to keep it there for now.. What fuse am I looking for?

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mizzouguy · May 26, 2017

I'm not sure how it operates, if it needs the fuse in there to stay in 2wd or not. In the side panel of the dash there is a 15 amp fuse labeled 4WD.

PG01 · May 26, 2017

Id go for a drive in auto(cause it stuck there) and while moving hit the button for 2wd and see if that works....just an idea

rockola1971 · May 26, 2017

If you are getting good shift motor transfer case shifts sometimes then your fuse for the that circuit is good and your problem most likely is in the shift motor itself. The system is lost and doesnt know at times what gear (transfer case) is physically in. That info is reported to the 4wd module via the encoder ring (inside the transfer case shift motor assembly).
Have a look at this thread: http://www.tahoeyukonforum.com/threads/the-dreaded-service-4wd-message.92644/#post-1110046

Fless · May 27, 2017

^^ X2 most likely TC shift motor. Had same issues with mine and a new shift motor cured it. Not difficult at all to replace.

dubfreaks · May 27, 2017

We scanned it yesterday and we got 4 codes all referencing the transfer case

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dubfreaks · Jun 7, 2017

Update: since last post, truck was stuck in 4hi, wouldn't come out, we tried a new switch, nothing. So we swapped out out the transfer case module, now we are stuck back in auto4wd; back to square 1.. any suggestions...

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mizzouguy · Jun 7, 2017

Did you ever change out the fluid and make sure it had auto-trak 2 in it? The blue stuff? People never believe me when I say as it gets old/dirty it'll cause problems.
EDIT: Did you change out the motor or the control module? My money is on the motor if you already did the module. I'd still do a fluid change with the new motor though.

Stuck in Auto4wd

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Fless

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