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4 wheel drive switch replace 2004 GMC Sierra

My 4 wheel drive continues to change to 4L and 4H and then 2Wheel Drive and 4Wheel Drive whenever I press a button on the switch. I recently had the transfer case rebuilt and now am having the issues with the 4 wheeldrive not acting properly. I bought a new switch and attempted to replace it and it seemed to switch between gears with no hesitation on the switch but when I started moving the truck got stuck in 4L and didn't want to come out. Finally after cutting the truck off and turning it back on the truck seemed to come out and back into 2 wheel drive. I then RE-installed the old switch just so I could atleast get back to where I was in the first place. I am not sure that the switch isn't the problem... because I may not have installed it properly. Should I disconnect any battery terminals or do anything before replacing the switch that would help to actuate the switch or is it just a simple plug and play deal and something else is wrong.

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Posted on Jan 02, 2017

smartr10U
  • 1305 Answers

SOURCE: Instrument cluster says " Service 4 Wheel Drive". No 4 wheel drive while this is on.

Two possibilites:
Have you been thru a car wash lately?

Also,
There is a sensor in the trans that senses what gear mode you're in...it either is working or it isn't....
are you still under warranty??
k

Posted on Jun 03, 2009

  • 17 Answers

SOURCE: stuck in 4 wheel drive and wont come out.

hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental

Posted on Aug 06, 2009

  • 1 Answer

SOURCE: 1990 Chevy 1500 4x4 won't engage 4 wheel drive

the 4x4 do not engage in my1990 chevy pick up what i need to check

Posted on Jan 20, 2010

  • 1 Answer

SOURCE: GMC Sierra 4 wheel drive won't disengage

i had the same issue change push button cluster

Posted on Dec 27, 2010

  • 1 Answer

SOURCE: My 2002 Gmc Envoy is stuck in 4wheel low. I

Before you spend a ton of money check the switch in the dash. Sometimes the metal just doesn't connect.

Posted on Jun 17, 2011

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Instrument cluster says " Service 4 Wheel Drive". No 4 wheel drive while this is on.


Two possibilites:
Have you been thru a car wash lately?

Also,
There is a sensor in the trans that senses what gear mode you're in...it either is working or it isn't....
are you still under warranty??
k

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  3. Change Gears to 4H while in neutral, change back to drive, and drive slowly 50 yards or so.
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This will cycle the fluid within your transfer case, and hopefully clean out the sensor. I did this, and my Service 4WD light went away after one day of normal driving. Hope this helps. Note: When I went into 4L the first go around, it had a hard time shifting due to non use. I changed between 4H and 4L a few times until it got smoother.

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