Question about 1996 GMC Jimmy

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1996 GmC Jimmy

Trouble shooting 4 wheel drive when button is hit it feel like transfer case engage but front axle do not engage

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  • Anonymous Mar 14, 2014

    mine has mechanical shifter for transfer case

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The vacuum actuator under the batteru could be bad

Posted on Nov 09, 2008

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1994 jimmy push button 4x4 wont engage


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

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Every time i push the button for the four wheel hi it makes the click noise in the front but DOES NOT ENGAGE. only the back tire spins


Depending on the year, it is not posted, it may be a bad transfer case motor. The clicking you are hearing is the motor trying to engage transfer case & front axle. It looks like a windshield wiper motor & when it gets power & works properly it engages front wheels. Again, depending on the year, may be 4 wheel drive actuator or switches bad on front axle or transfer case.

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1 Answer

4wd will not engage on my 2001 gmc jimmy


Try listening to the transfer case try to engage.The vacuum actuater on the firewall above the distributor was not allowing vacuum to the front axle actator. You can put the truck on jackstands (all 4 wheels) and check to see if the front drive shaft engages. If so, then it's probably the vacuum actuator or the axle actuator.

Dec 23, 2010 | 2001 GMC Jimmy

1 Answer

4wd 2001 gmc jimmy will not engage


it is possible one of the auto lock hubs is not engaging properly, look in your owners manual and trouble shoot with that but sounds like for some reason it will not engage in 4 wheel drive, sometimes the button is the problem, I am not a fan of the push button system gm has, and I prefer to engage the transfer case with the tried and true second gearshift in the middle of the floor good luck

Dec 17, 2010 | 2001 GMC Jimmy

1 Answer

1996 gmc jimmy started making noise sounding like it is is right front was told need to replace wheel hub which was done. Still making the same noise in 2 wheel drive. when you push button for 4 wheel...


Sounds like your front axle is trying to engage but does not engage fully.check your vacuum going to the t-case switch and then if that is ok check your vacuum at the front axle actuator.It is located under the battery tray.

Dec 06, 2010 | 1996 GMC Jimmy

2 Answers

What does the vacum switch on the transfur case do


It moves gears, most likely engauging the 4 wheel drive, and disconnecting it.

Sep 26, 2010 | 1998 GMC Jimmy

1 Answer

The front wheels on my 2000 gmc jimmy will not lock in 4hi or 4lo


In addition to transfer case engagement via an actuator on the "T" case there is a front axle actuator. On my Blazer which I'd bet is very similar.. There was a vacuum diaphragm under the battery which operated a cable to "lock in" front axle. make sure you have vacuum supply when asking for 4 wheel operation and make sure cable is not seized. If this checks out o.k. back to transfer case. your question asked about front wheels locking so I assumed your "T"case was working

Feb 19, 2010 | 2000 GMC Jimmy

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.

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3 Answers

1996 JIMMY / 4 WHEEL DR DOESN'T ENGAGE but LIGHT TURNS ON


Check the vacume line to the accuator for the cable, mine was rotted and busted. Replaced it . it goes under the battery. Problem solved

Dec 02, 2008 | 1996 GMC Jimmy

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