Question about 1999 GMC Jimmy

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My 99 jimmy's 4x4 will shift from time to time but not without playing with buttons and turning the vehicle on-off. I've cleaned connectors on the dash acctuator and the module behind the kick panel but still intermittent success.Someone mentioned an encoder motor and a transfer case module but no idea where these items are located or are they just different names for the parts i've already mentioned?

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Having had siimilar issues, I found my problem to be a non functioning solonoid that is the electronic switch for shifting from 2 to was located under the battery tray. My mechanic had to follow the cord to find the solonoid, and once replaced shifts fine.

Posted on Aug 31, 2010

Testimonial: "Excellent, great advice from people who have dealt with issues that would cost you hundreds to deal with otherwise"

  • Apollo Morelos
    Apollo Morelos Nov 13, 2010

    if that don't fix the problem check you vacuum hose the one that is connected to the actuator some. if the hose is out of round or pinched it will give you problem it will not go from 4hi to 4 low or vise versa.



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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

4x4 wont work

Sorry would need a play and a drive so ask a local mechanic to have a look for you ,could be simple or a complicated thing like a drive shaft broke

Feb 17, 2014 | 2000 GMC Jimmy

1 Answer

How do I know when my gmc jimmy is in 2hi 4hi 4lo and 4x4 never owned a 4x4 before have no idea

I have a 99 jimmy, mine has a button in dash with 2hi and 4 hi button.

Sep 20, 2013 | Cars & Trucks

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99 jimmy vibrating when i drive it. u joint? how to tell which one

You will have to get under the vehicle, and grab the drive shaft at each u-joint. Grab the first one, and move it up, down, and side to side to look for any play. Also pay attention to missing pieces, and missing clips that hold the u-joint in.

Another thing to check is your wheel bearings. Jack the rear up, and grab each tire at 3o'Clock and 9o'clock first, and then 12o'clock and 6o'clock. Wiggle/shake it looking for play. Do the front tires the same way. You should find it.

Most common reasons for vibrations

Uneven tire wear (alignment)
Unbalanced tires
Universal joints

Apr 14, 2011 | 1999 GMC Jimmy

2 Answers

Cant get out of four wheel drive

If your truck has a dashboard push-button 4x4, then carefully disassemble and clean with Q-tips and alcohol. when 4x4 lights turn off, drive in reverse over 15 feet. Good luck.

Nov 20, 2010 | 1999 GMC Jimmy

1 Answer

Shifted into four wheel drive. went to shift back in to 2 hi and now the transmisson wont shift

my 99 jimmy shifts into 4lo all the time.
1. Turn truck off
2. set parking brake
3. start truck and shift into neutral
4. push 2hi button(should shift back)
put back in park,release brake
might work for you

Dec 25, 2009 | 1998 GMC Jimmy

1 Answer

I have never driver a 4 wheel drive. I am going from portland oregon to phoenix az. not sure how or when to switch to four wheel. does the truck need to be in park? etc.

Do you have manual locking hubs on the front? If you do, you have to turn them to 'lock' position. If you have automatic hubs, you skip that step. Never shift into 4x4 low range while moving. You must come to a complete stop to shift in or out of low range. Regular 4x4 (high range) can be engaged while you are moving. Let off the gas, and put it in 4x4 high range, do the same to go back to 2 wheel drive. Vehicles that are part time 4x4 (can be shifted in and out of 4x4) should never be driven in 4x4 while on a dry surface, as you can cause excessive wear or even failure of the system. So only use it in snow, off road, etc. Have a safe trip!

Dec 13, 2009 | 1994 GMC Jimmy

1 Answer

My truck is stuck in 4LO and the button in the truck dont work.

If its a push button 4x4 take it to the shop its a VERY COMMON Problem dealing with the electric.Once you pay the $400 to get it fixed get rid of the truck and settle for a Jimmy/Blazer/Bravada with a floor shift 4x4..GM had problems with the push button 4x4.DONT DRIVE YOUR TRUCK IN THE MEANTIME.YOU WILL BLOW YOUR TRANSFER CASE RIGHT OUT OF IT!

May 20, 2009 | 1998 GMC Jimmy

1 Answer

Shifting out of 4 wheel drive electric shift on 1998 gmc jimmy

check the control module located behind pass.side kick panel undo connector plug youll find corrosion on 2pins clean them ,

Feb 23, 2009 | 1998 Chevrolet Blazer

1 Answer


I had the same problem with my 99 Jimmy. try to disconnect your battery for about 5 minutes and see what happen. it fixed mine by doing it.

Feb 05, 2009 | 1997 GMC Jimmy

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