Question about 2004 Chevrolet Chevrolet Tahoe Z71

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2004 Tahoe 4 wheel drive will not work. It has "service 4 Wheel" on dash.

4 wheel drive switches will not work. Service alert "service 4 wheel drive"

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It's probably the encoder motor in the transfer case or if your lucky the dash switch. If you search YouTube there is a video showing you how to test the dash switch with a ohm meter

Posted on Jun 01, 2014

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4 wheel will not work. the selector switch will show it is in but front tires will not engage No messages on control center


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1 Answer

4 wheel drive


there is 2 things to look at. 1 is there is a electronic actuator on the transfer case and the other is there is a transfer case control module under the dash on the drivers side next to the steering colunm

Feb 01, 2013 | 2003 Chevrolet Tahoe

2 Answers

I have a 1998 Chevy Tahoe with the service 4wd light on and cannot switch out of 4wd, can it still be driven and what could be the problem?


if its electric shift. its probly the shifter motor. start vehicle open the door listen 4 the shifter motor. 2 see if you can hear it trying 2 shift. if not thats what it is if you can hear it tryng 2 shift it mite be vacume lines

Feb 13, 2010 | 1998 Chevrolet Tahoe

1 Answer

4 wheel drive selector switch lights go off and when they come back on the tahoe is in 4 low 2004 Chevy Tahoe Z-71 Sometimes the switch will show to be in Neutral. We have already replaced selector switch!


new doesn't mean good, scan the computer for codes and use that code trouble tree.may have wires chewed into and touching from rodents check wires very closely on top of trans. not normal for the dash switch to short out either. may need to replace the contol module and reprogram hope this helps.

Dec 06, 2009 | 2004 Chevrolet Tahoe

2 Answers

Four wheel drive wont engage


If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion. You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.

The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 21, 2009 | 2004 Chevrolet Suburban

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