My 2002 chevy silverado 4x4 will not disengage from 4 wheel lo to 4x4 hi, 2 wheel drive or 4x4 auto. I tried while driving forward , backwards and sitting. The 4x4 activates by push button. Any suggestions? Thanks Gary

Go under the vehicle and check the four wheel drive linkage.

most if all problems with the chevy 4x4 at the beginning of problems are the electronics the switches they put crap in the truck and wonder why so many problems to anyone whom sees a problem at the start should first and i mean first clean all the contacts on 4x4 switches the two on the dash and then one on transfer case the one inside the dash sits where people sit drinks like coffee then it runs down dash and onto the switch inside dash you need to take it out clean it good i have fixed more 4x4 problems with doing this first you will not hear this from the dealerships they will tell you you need to replace them when all it is that they need a good cleaning i also take the switch on dash apart and clean contacts then the lights work please try contact cleaner first and more times over it will fix your problems

On these issue, there are few solved help links for troubleshooting the issue easily.-------

Click the link below: ---

No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

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Car will not go into 4WD high or 4WD low?

http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

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No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

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2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

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Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

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4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

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2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

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4x4 will not engage on Ford F150?

http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing

4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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Ford 4x4 front wheels will not engage?

http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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These details will help.

Thanks.

under your batt tray needs removed youll find a rubber hose goin to a vacume canastersee that it aint cracked or got a hole

You need to have the dealer scan the control module to see what codes show in memory

4 lo is all the way forward toward the firewall or engine compartment, 4 high is all the way back toward seats. the second position forward from the seat would be 2 high the 3 position forward from the seat would be a nuetral position for the transfercase.

try selecting from nutreul or less then 3km

most 4x4s have to go in reverse to disengage from 4 wheel drive to 2 wheel drive.

check vaccum actuator on front diff?use vaccum gauge should be 25 to 30lbs to open had same problem 94 gmc sierra ext cabb 4x4 5.7 ordrive tranny

pull atc 25 amp fuse in underhood fuse center and 10 amp 4wd fuse inside cars fuse box,your problem is in control box behind kick panel on pass. side ,corrosion build up,