4wd bad on GMC

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4wd bad on GMC

Postby hondarancher » Wed Jun 25, 2008 12:02 am

i have a 2005 gmc and several months ago my service four wheel drive light started coming on and going off. took it to the dealership and they checked the computer and everything looked ok. we packed the plug going into the transmission with dieelectrode greese and that fixed it for a little while. now the service 4wd stays on constantly and none of my push button 4wd buttons light up or work. how am i suppose to go off road when my 4wd does not work????? anyone had this problem???? :help:
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Postby Montanafowler » Wed Jun 25, 2008 4:24 am

is your transfer case engaging the 4x4? it may just be the wiring in the buttons.
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Postby hondarancher » Wed Jun 25, 2008 8:16 am

no it will not go into 4wd at all. one day before the buttons completely went out it decided on its on that it wanted to be in 4 low and i had to turn my truck off and back on to get it to do anything. i mean you can push the 4wd buttons all day and it won't do a damn thing
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Postby bgoldhunter » Wed Jun 25, 2008 10:36 am

Sounds like the typical GM encoder motor problem to me...
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Postby hondarancher » Wed Jun 25, 2008 10:23 pm

when i took it to them a few months ago we looked on the GM website to look for related problems and everything we found said there had to be some kind of wiring harness made
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Postby fowl_wishes » Thu Jun 26, 2008 5:18 am

bgoldhunter wrote:Sounds like the typical GM encoder motor problem to me...
:dito:

Have also seen a bad 4x4 control module do something similar.
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Postby rmb79 » Sun Jun 29, 2008 9:17 pm

I had the same symptoms on my 2000 sierra. The light service light came on, the indicator light (2WD, 4WD, Hi, LO) did not work, and the truck would not engage in 4WD. One time I was stuck in 4 Low and had to drive 10 miles very slowly until it disengaged.

I had a switch/sensor replaced in the 4WD push button colum. $95 problem fixed. Haven't had an issue since. That was back in 2005.
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Postby hondarancher » Tue Jul 01, 2008 12:53 am

thanks guys. i figured it was the push button switch causing the whole thing. i will try that first cause the people at the dealership have not a clue on how to fix it.
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4x4

Postby BrokenWing » Thu Aug 07, 2008 7:01 pm

once in a while my truck will shift itself into four wheel drive by itself, don't know why the truck is usally in park and off when it happens. :huh:
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Postby MOSSBERG935 » Thu Aug 07, 2008 7:09 pm

i had the same problem with my truck...the dealer ended up replacing the buttons two or three times....wiring harness.....computer and actuator.....my truck was in my local chevy dealer a lot with 4x4 problems.....don't let the warranty run out and don't pay for anything....call chevrolet directly and complain...they will fix it.
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Postby CountryboyNC » Sun Aug 31, 2008 10:19 am

i dont nkow if you ever fixed your problem but its gonna be your switch behind the push buttons, i had the same problem on my 04 z71 and all i had to do is soder(sp) a new one in.
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Postby lockedup » Tue Oct 28, 2008 7:54 am

check the vacuum lines and vacuum check valves. they are the leading cause of electric 4x4 failure
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Postby matte » Thu Nov 13, 2008 1:35 pm

lockedup wrote:check the vacuum lines and vacuum check valves. they are the leading cause of electric 4x4 failure



None of that stuff is vaccum controlled anymore, anyways chevy had lots of problems with their push button switches and most notoriously for funky actions was the encoder motor. wont say for sure but it sure seems like an encoder problem
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Postby 919QuackerStacker » Thu Nov 13, 2008 4:37 pm

sell it and get a ford
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Postby lockedup » Thu Nov 13, 2008 8:23 pm

matte wrote:
lockedup wrote:check the vacuum lines and vacuum check valves. they are the leading cause of electric 4x4 failure



None of that stuff is vaccum controlled anymore, anyways chevy had lots of problems with their push button switches and most notoriously for funky actions was the encoder motor. wont say for sure but it sure seems like an encoder problem



Do you own a 4x4 chevy? I know that IFS 4x4 is vacuum controled, encoder motor or not, the IFS will not engage without a vacuum actuated cable. Half of the 4x4 system is vacuum.
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Postby matte » Fri Nov 14, 2008 8:17 am

i dont own a 4x4 but i own a chevy truck, i used to be a mechanic for gm just a year ago, and on the newer trucks they are all electronic controlled. the front axle is locked together by and electric actuator, and the transfer case is coupled by the encoder motor which is electric controlled.
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Postby blineman » Mon Feb 23, 2009 11:26 am

919QuackerStacker wrote:sell it and get a ford


DITTO :rofl:
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