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Old 07-14-2014, 04:16 PM   #1
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Chevrolet transfer case issues

Anyone towing with a chevy 1500 HD or 2500 HD and gotten the "service 4wd" indicator?
I have several times now and can tell you what the problem is. Its the servo motor and its positioning indicator in the transfer case. This would be the models with the push button 4WD/AWD/2WD etc. What a pain in the .

Anyway, just had mine replace again. Hopefully this one will last a couple months before the truck goes bye bye.

This is not on the newer models. My truck is a '06 with 85000 miles.
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Old 07-14-2014, 07:25 PM   #2
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I had a problem with mine couple years ago. I would start it and it would magically be in 4x4 or that in descript red light between 2 and 4 wheel high. I would reset it but would do it on start up. Turns out battery was going bad. It would start up fine. Changed battery and not a problem since. May be worth checking out. There was no other indication that battery was going out.
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Old 07-14-2014, 07:37 PM   #3
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What has the light have to do with the battery? The red light was on the 4x4 position (I have the rotary knob and the knob was on 2x4) just the other day and I thought that was really strange. Have never gotten the service 4x4 light though.
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Old 07-14-2014, 08:47 PM   #4
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I don't know. As it was explained to me "these newer vehicles require a lot of battery power". I had two dead cells but truck always started right up. I thought BS but bought a new battery. I have not had a problem since. No service light or issues with lights and spontaneous drive changes since.
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Old 07-15-2014, 09:43 AM   #5
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We have the 2004.5 Chevy 2500hd 4x4 with the push button transfer case and have never had that issue and we have over 210000 miles on it. The only issue we have had is a couple of seals leaking other then that no major issues. It got used a lot this winter specialy when we got almost 2 feet of snow and our neighbor hood didn't get blowed out for almost 2 weeks.
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Old 07-15-2014, 01:58 PM   #6
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More information on this for possible causes at the link below.

http://www.gm-trucks.com/forums/topi...7-service-4wd/
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Old 07-15-2014, 07:57 PM   #7
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Auto Zone can check your codes. They can also check battery. If no codes, and battery checks out you may try disconnecting battery and then reconnect. This will possibly reset your computer. I would try it before throwing parts at it.
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Old 07-15-2014, 08:46 PM   #8
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Just to clarify, I know the problem, its the encoder motor on some go bad. Shifts your transfer case by itself. Its a fairly common issue. Just wanted to share in case anyone else has this issue come up. Whatever you do, do not let anyone tear into the transfer case to "fix it". This part is an externally mounted unit.
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Old 07-16-2014, 07:40 PM   #9
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You can also just replace the encoder motor sensor, pretty straight forward, the problem is that you need to visit a dealer to have the transfer case control module reprogrammed.
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Old 07-19-2014, 11:28 AM   #10
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Additionally, everyone should make a habit of checking the fluid level in the Xfer case on a regular basis. I just checked ours yesterday. There is a known issue (well known on the diesel forums) about what is called the "pump rub" problem.

basically a very cheap (very cheap) part has an issue allowing a pin hole to be rubbed in the Xfer case and the fluid to be lost.

use this as a Google search gm pump rub problem

here are some magazine articles on the problem

http://www.8-lug.com/tech/1210_8l_gm...mp_rub_repair/

http://www.dieselpowermag.com/tech/1...ting_disaster/
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