Question about 1999 GMC Sonoma

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4wd wont engage on 1999 gmc sonoma

4wd indicator lights up,hear the click went turned on,no front wheel drive

Posted by Anonymous on

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  • 2 Answers

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: 1996 GMC Sonoma

the front diff. is engeged by a thermal acuator in the front center section. check that the wiring on the pass. side of the front axle is of, if so the the acuator is probably faulty. Best to get an aftermarket posi-locking shifter if you need to replace the thermal unit.

Posted on Nov 08, 2008

  • 62 Answers

SOURCE: 4 wheel drive does'nt work on my 1999 jimmy

change the selector switch first it is by far the cheapest

Posted on Dec 20, 2008

  • 59 Answers

SOURCE: 4wd will not engage on 2002 gmc sierra 1500

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

Posted on Jul 04, 2009

  • 103 Answers

SOURCE: front axle is not engaging when put i 4wd,2000 gmc

is the front tail shaft turning,if not problem is in transfer case

Posted on Jan 01, 2010

  • 2 Answers

SOURCE: 1999 gmc sonoma, auto, push button 4wd. jacked the

Ive gone thru this THREE TIMES w/ my '99! Theres a thin, rubber vacuum hose that wears thin, gets dirt/oil/water in it & shorts a relay. The last mechanic replaced the hose w/ steel brakeline & Ive had no problems for 2 yrs.

Posted on Mar 26, 2010

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2003. Why doesn't 4wd work?


How to Diagnose and Repair Chevy Blazer and ... - YouTube

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https://www.youtube.com/watch?v=IP0jhBG0jv4
Jun 30, 2012 - Uploaded by Mark Jenkins
How to Diagnose and Repair Chevy Blazer and GMC Jimmy 4WD\ 4x4 Issues .... The transfer case either doesn't want to engage, or it gets stuck in 4 lo. ... my s10 4x4, I watch your videos and I start to work on my truck,I start ...

How To Install Replace 4WD Front Axle Vacuum Actuator ...

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https://www.youtube.com/watch?v=stooGR4BcjE
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I have a 1996 chevy blazer ls...my 4 wheel drive stoppedworking. ... 4l and I hear the click underneath me, but that's it..itdoesn't engage, but the ... I have a 2003 gmc Sonoma and when I put it into 4 high it feels like it does

Nov 19, 2015 | Chevrolet Blazer Cars & Trucks

1 Answer

Why won't 4 wheel drive engage?


4WD Transfer Case Position Sensor/Selector Switch May ...

repairpal.com > Problems > GMC > Sierra 1500
you can hear the transfer case kickin in, but the front wont lock in. replace the actuator and ... service 4wd indicator came on after trouble trying to engage 4wd.

Aug 11, 2015 | Cars & Trucks

1 Answer

Every thing work for my 4wd onvmy 2000 gmc z71 pickup the switxh actuators transfer case and diff but the front tires won't turn u can hear the transfer motor work and the actutor engagin but the front...


jack up front wheels turn a front wheel it should turn front drive shaft with 4wd engaged and the other wheel should turn backwards if it does that part is good if not possible broken axel

Feb 20, 2015 | GMC Cars & Trucks

1 Answer

No 4wd. on 1999 gmc sonoma


sounds like a vaccum hose is off

Dec 30, 2012 | 1999 GMC Sonoma

1 Answer

Stuck in 4 wheel lo, how do i get it back to 2 wheel hi ?


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

-----------

4X4 Truck makes roaring noise in the front end?

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

-------------

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

--------------

No 4x4 light on dash?

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

------------

4 wheel drive system will not disengage?

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

----------

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

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

----------

2002 Jeep Wrangler: 4WD Idiot Light is ON?

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

----------

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

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

-----------

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

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

------------

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

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

----------

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

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

-------

4x4 will not engage on Ford F150?

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

-------------

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

----------

Ford 4x4 front wheels will not engage?

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

-------------

These details will help.

Thanks.

Dec 09, 2012 | 1999 Chevrolet Blazer

1 Answer

How to set the 4x4 electronic selector switch on a jimmy 2002


4X4

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

-----------

4X4 Truck makes roaring noise in the front end?

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

-------------

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

--------------

No 4x4 light on dash?

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

------------

4 wheel drive system will not disengage?

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

----------

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

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

----------

2002 Jeep Wrangler: 4WD Idiot Light is ON?

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

----------

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

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

-----------

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

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

------------

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

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

----------

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

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

-------

4x4 will not engage on Ford F150?

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

-------------

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

----------

Ford 4x4 front wheels will not engage?

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

-------------

These details will help.

Thanks.

Nov 28, 2012 | GMC Cars & Trucks

1 Answer

4wd front hub wont disengage


Possible the vacuum bleed-off to the switch you installed isn't allowing it to completely disengage. Pull the bleed-off line from the new switch and see if it works. could be just a tight spot/bent closed in the bleed-off line or the vent plugged.

Apr 04, 2017 | 2002 GMC Sonoma Extended Cab

1 Answer

I have a 1999 blazer zr2 with the 4.3 vortec OK now hears the problem to day when i was driveing in the snow i had to use the 4wd so i stopped and hit the 4wd button and it clicked and sounded like it...


Sound crazy, but alot recommendations say thet when you pass from Hi to Lo must insure that you have foot on the brake pedal.

Loss of vacuum engages the front hubs; other for no 4 wheel drive and no indicator light. Go home pulled all the fuses that had to do with the 4 wheel drive system, put them back in and 4 wheel seems to work fine now. And no there were no blown fuses.

I recently had same case and it was a bad electric motor on the transfer case (31000 miles). The 4x4 light wouldn't even light up or engage so I would lean towards it being something different on your end.
Also, could be the actuator pin or w/e the little plastic piece is that engages the 4LO might be broke, or maybe a couple of other things.

Keep us updated.


Jan 22, 2011 | 1999 Chevrolet Blazer

1 Answer

1999 gmc sonoma, auto, push button 4wd. jacked the rear wheels off the ground and pushed 4wd button, front drive shaft turns, but no power to front wheels, seems like everything is working like it should,...


Ive gone thru this THREE TIMES w/ my '99! Theres a thin, rubber vacuum hose that wears thin, gets dirt/oil/water in it & shorts a relay. The last mechanic replaced the hose w/ steel brakeline & Ive had no problems for 2 yrs.

Jan 18, 2010 | 1999 GMC Sonoma

1 Answer

1999 Jimmy 4wd not engaging. It has push button


could be your front actuator or your actuator motor on the transfer case.

Apr 12, 2009 | 1999 GMC Jimmy

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