Question about 1994 GMC Jimmy

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4x4 not shifting into high

My 1994 jimmy will go into 4x4 low, but will not go in to 4x4 high. the light selector for the hi/lo sitch also blinks and both lightsstay lit. even when in 4x4 low sometimes. any help out there

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  • coracommande Jan 29, 2009

    if it shifts ino 4x4 lo and back to 2hi, that would mean the motor still works right? do you think it could be the switch or control module? or is th electric transfer case motor control the selection?

  • Anonymous Feb 07, 2009

    hi i got a question my 94 gmc jimmy 4x4 wont go into 4 wheel drive do where would i find a vacumm diagram to the 4x4 or what can i do

  • rivercityaut May 04, 2009

    yes have the same problem goes into low but not high light stay lit all that good stuff so whats a good solution or something i can try to fix this



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I have changed the transfer case motor & 4x4 selector switch an 4x4 high still wont work.

Posted on Feb 04, 2015

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Hi how are you doing? just had same problem with by gmc i replaced the transfurcase motor and it works fine. the electric motor moves the shifter in your transfurcase from 4hi to 4lo and 2hi.there is only 3 things that operate your 4x4 the switch the motor and the control modgual.

Posted on Jan 28, 2009

  • Raymond l Vincent Jr
    Raymond l Vincent Jr Jan 29, 2009

    hi the motor moves into two positions the signal from the switch tells wich position for the motor to is only moving into one position.



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2 Answers

Why won't truck shift into 4wd, hi or lo?

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Oct 14, 2017 | Cars & Trucks

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I have a few99 gmt jimmy with the automatic 4x4 buttons. I can't get it out of 4x4. Please help

Well from experience 99%. Of the time its not the actuator if it shifts into 4 lo and back to 4 hi. The book really sucks at this diagnosis. And if lights on buttons blink for 2 hi for a bit then stay in 4wd then u have to listen very carefully. When shifting from 4 hi. To 4 low the whine or growling noise from motor is heard. If, when shifting from 4 hi to 2wd this motor noise is heard, then actoator or wiring is the issue. If the time while 2wd light is blinking, ie: its trying to shift, no noise from motor or actuator is heard, then shift module has a burnt output. Now. Before replacing any of the components, if you have a schematic of this system, you would be confused on how any of it elworks even if you are a seasoned professional. I wouldn\'t bother 2 much with it as long as you theory inspect Evey millimeter of all the wires from actuator connector (on transfercase) to where it goes through metal and enters occupant compartment. If all wires look good. Lights in all 3, or 4 if u were lucky in neutral which means error, of the lights work, and if requested position is depressed on switch and motor tries to turn or does and clynks are heard , then actuator position switch is stuck and actuator is needing replaced, as not a serviceable assesembly, and I haven\'t had the ability to tear one apart. But if all lights work and when the selected switch button , example 4 WD, 2 WD or 4 lo, and no motor noise like heard when other shift works, them module is to blame. Now, I am a master mechanic with most experience at a gm dealership, I have fought with this system multiple times, and once I employed this diagnosis it has never failed me again. And the stack of 4wd shift modules in my bottom toolbox dawyer. Most times if won\'t shit at all night be actuator but not likely, 95% of the time when this issue rolled through dealership, it took a module to fix it.

Jun 23, 2014 | Cars & Trucks

1 Answer

How to use the 4x4

well, if you are sitting still it is recommended you put vehicle in neutral and select 4x4 indicator to desired posistion..... 4 high...4 low...or 2high (auto) when you select 4 low the top speed is not to exceed 25 mph. It is a very low gear for crawling or pulling. At any time you need 4 low gear you must stop trk, shift to neutral and select 4 low. The same procedure is done to change from 4 low to 4 hi or 2 hi. if not done this way internal trans, transfer case or driveline failure will occure. At any time you may shift 4x4 selector from (auto) or 2 hi to 4 hi, and 4 hi to 2 hi or( auto).****** But note, do not make shifts while tires are spinning or under power (acceleration)******* While driving you can make shifts at any speed between 2 hi (auto) and 4 hi and back to 2 hi. release throttle a little and select. you do not have to take foot off throttle all the way! just enough that truck is not under a power, load acceleration. If tires are spinning or you are on the gas and you select gears from 2 & 4 high the posibilities of severe damage can result. Also note that 4x4 is not recommended on dry pavement. When 4x4 is being used also take care as to the handling and the steering characteristics change, On tight turns the front wheels will bind and possibly **** a little. If you have never had a 4x4 before, obey what i have told you untill you get the experiance and you will be fine. HAPPY TRAILS.... AND A LITTLE 4X4 FUN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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1 Answer

Where is shift actuator located on 1999 Jimmy 1999

I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.

Nov 22, 2010 | 1999 GMC Jimmy

2 Answers

The 4-wheel drive on our 2001 GMC Jimmy does not seem to engage. It is new to us and came with no manuals. Are we doing something wrong or is it just not working?

First and foremost can you tell me if the lights are showing up on the 4x4 selector switch ? Second if they are illuminated ( should be in 2-Hi ) when you select to go into 4-Hi or 4-Low does the selection flash? And Lastly can you hear a sound of any type (clicking, ticking, thumping) when you push the button?

Jan 01, 2010 | 2001 GMC Jimmy

1 Answer

My SUV is stuck in the 4X4L mode.

In order to get it to shift in or out of 4 lo the transmission must be in neutral with your foot on the brake and moving less than 5 mph. If it still does't change try tapping the shift motor with a block of wood, it could be stuck

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Can,t get truck out of 4x4 low range

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Aug 26, 2008 | 1999 Ford F250 Regular Cab

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