Question about 1994 GMC Jimmy

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1994 jimmy push button 4x4 wont engage

1994 GMC jimmy 4.3 ltr vortec. Push button 4x4. I push 4 low transfer case engages into low gear but front hubs don't engage. the truck is in 2 wheel drive but in low range.

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  • 66 Answers

Could be the servo on the front diff not activating. Could be a power prob or failed unit.

Posted on Jan 17, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Molson02536
  • 3854 Answers

SOURCE: 1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Posted on Jan 02, 2010

Testimonial: "This is exactly the info i need to troubleshoot and repair efficiently complete with wire numbers and colors thanks for the help buddy"

  • 6 Answers

SOURCE: Front drive, 4 Wheel drive won't engage

Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel

Posted on Feb 16, 2009

  • 3 Answers

SOURCE: 2000 gmc yukon xl 4x4 wont engage

see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL

Posted on Feb 28, 2009

poolgod27ia
  • 1 Answer

SOURCE: 4x4 will not engage in 96 gmc yukon

I just fixed a friend of mines 96 yukon...shift to neutral press 4H and u can hear the actuator make noise (we even replaced it with a new one his idea and the same thing happen as old one), so as he hit the switch for 4H i layed under it (on 4 jack stands) and I could hear the motor on the transfer case make a loud noise (well thats working) and before all this I asked him did u check all your fuses (he said guarnteed to be all good) one night it was bothering me so i looked through the owner manual for the yukon and in the fuse box on driver side by the door there are (2) fuse for the 4wheel drive unit,pull one of the fuses good...pulled the other one and it was blown put in a new fuse and it works like brand new..pull fuse for anything that has to do with 4 wheel drive componants,

Posted on May 03, 2009

lindsay836
  • 677 Answers

SOURCE: 4x4 push button is not working about how much does

This is something you can do yourself if you have ever worked on a vehicle before. The part you need is called a front drive actuator valve. It costs about $ 50.00, GM part # 15165891.
Here is some more infor about it:

Main 4wd Components:
TCCM
- Transfer Case Control Module - Located behind the glove box. This is the electronic 'brains' behind the shifting.
Switch - The push button switch in the dash - driver input/indicator.
Encoder Motor - Located on the transfer case - This is what actually shifts the transfer case, and tells the TCCM what position it is in.
Vacuum Switch - Also located on the transfer case - This is what sends vacuum to the vacuum actuator (see below) when the transfer care is in 4HI or 4LO.
Vacuum Actuator - Located under the battery tray - This is what engages or disengages the front driveshaft.
Front Axle Switch - Located on the front axle - This is what tells the TCCM when the front axle is engaged.

If you want to try and replace it yourself, please let me know how it goes.

Posted on Feb 12, 2010

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1 Answer

I have a 98 gmc jimmy the 4x4 is not working it has the push button on the dash and when you put it in 4x4 the lights work but it dont go into 4x4


Sounds like the transfer case motor is going out or bad, i know the trucks have a 4x4 engagement motor on the front differential which engages the front axles. i am not sure how yours is setup, you will have one or the other.

Dec 18, 2013 | GMC Jimmy Cars & Trucks

1 Answer

How to engage the 4x4


This depends on what system you have installed in your truck. If you have push button 4x4 with auto locking hubs then you would put your vehicle in neutral and press the 4x4 button. You then drive froward about 10 feet and the auto locking hubs should then be engaged.

If you do not have push button control and you have a gear shifter which controls the transfer case you would push the level in 4x4 hi or low depending on what you want (while in neutral) then drive forward about ten feet so the hubs lock. If you have manual locking hubs you need to manually engage the hubs before you put it in 4x4 mode,

Apr 06, 2010 | 1994 Ford F150 Styleside Supercab

1 Answer

4x4 push button is not working about how much does


This is something you can do yourself if you have ever worked on a vehicle before. The part you need is called a front drive actuator valve. It costs about $ 50.00, GM part # 15165891.
Here is some more infor about it:

Main 4wd Components:
TCCM
- Transfer Case Control Module - Located behind the glove box. This is the electronic 'brains' behind the shifting.
Switch - The push button switch in the dash - driver input/indicator.
Encoder Motor - Located on the transfer case - This is what actually shifts the transfer case, and tells the TCCM what position it is in.
Vacuum Switch - Also located on the transfer case - This is what sends vacuum to the vacuum actuator (see below) when the transfer care is in 4HI or 4LO.
Vacuum Actuator - Located under the battery tray - This is what engages or disengages the front driveshaft.
Front Axle Switch - Located on the front axle - This is what tells the TCCM when the front axle is engaged.

If you want to try and replace it yourself, please let me know how it goes.

Feb 11, 2010 | 1998 GMC Jimmy

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

2 Answers

2000 gmc yukon xl 4x4 wont engage


try replacing decoder module on transfer case they are known to go bad causing same problem.

Jan 02, 2009 | 2000 GMC Yukon XL

1 Answer

4x4 not working


Hello;
Have you checked the front axle shift solenoid? I have seen these break and have seen the fork shear as well.Make sure it is engaging when you push the button.
Thanks;
Rich
RPM Northwest

Dec 29, 2008 | 1994 GMC Jimmy

2 Answers

4wd high range does not lite or engage


I had the same problem with my 98 sierra 4x4. Turned out that the electrical activator on the transfer case was not working. It will still go into 4 low but not 4 high. Replace the electrical switch on the transfer case and it should work again.

Dec 29, 2008 | 1998 GMC Jimmy

2 Answers

97 GMC JIMMY (4X4 PUSH BUTTON PROBLEM)


have a 1998 gmc jimmy stuck in 4-wheel low. the button clicks, and the motor underneath makes noise like it wants to desingage but does not.

Dec 15, 2008 | 1998 GMC Jimmy

1 Answer

2000jimmy4x4


The 4x4 actuator located on the front axel/tranny transfer case is probably faulty. Make sure the electrical connector that goes to it isn't damaged. Should be a easy fix.

Oct 23, 2008 | 2000 GMC Jimmy

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