Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!





GMC Jimmy 4WD Problems

13468915

Comments

  • I have a 2000 jimmy with the automatic button. The check 4x4 light came on for a min. or so and went out. The wife was coming home and put it in 4 auto and was fine, when she got to a really bad roar she tried to put it into 4x4 hi but it went into 4 lo. Then it would not come out. when she got home and told me I went to check it out and it went right into 4x4 hi, then I pushed 4x4 auto and it went ito that. I pushed 4x4 hi again and it went ito lo and will not come out. What is up with this . I guess I need some help bad. thanks
  • hi this is brian i also have a 2000 jimmy 4x4 im also haveing the same type of prob i was told to check the vacuum actuator its under the battery try its got a vacuum hose and a cabel leaver check that and see if it holds when u push it in hold ur finger over the vacuum hole and it should stay in if not thats ur prob also follow the vacuum line up the the fire wall and ull see a peace with to hoses on it with a wire that gose to ur 4wd lights in side hope i helped u. im haveing the same problem mine wont lock in to 4wd and my lights aren't comeing on at all hope i helped good luck
  • i have a 2000 gmc jimmy i'm having problems trying to get the 2wd back i changed the tccm computer on the kick panel did that because the lights in side didn't work because i went in water with my truck now the lights are back on but its saying its in 4wd lo and will not come back out i hit the buttons the just flash and go's back to 4wd lo can hear it trying to go in to 2wd but nothing happen check all vacuum and vacuum actuator under the battery tray all good followed vacuum line from actuator up to fire wall all looks good not sure if thats the problem the hoses going to the fire wall looks good don't no if its working right any one have any clue what may be wrong :mad:
  • i have the 3 button style with 2 hi, 4 hi, and 4low. I've read all the postings in this section so i have already checked the vacuum lines and there ok , the actuator under the battery tray is working, i can hear the transfer case motor changing when i select 4 hi so i assume that is working also. but only the rear wheels are spining in the snow. any suggestions ???
  • i finally got mine working, I found out it was the puttons in the dash, I replaced them and now it works. :)
  • My 4x4 lights keep flashing and not allowing me to press any of them.
    I've disconnected the battery but still nothing.

    Also, the head gasket just went and we replaced it, but now the truck is running rough, like there is a vacuum loose. Any suggestions.

    Thanks
    Jenn
  • hey this is brian when u did the head gasket did u check to make sure the timeings on look and make sure its TOD to dead senter the timeing markes on the crank also check the TCCM on the pass side kick panel if u have any more Qess let me now ill try to help u out the best i can brian
  • hi this is brian did u check the plug on the diff to make sure the ball moves in and out like it should check that bc i had to check mine not sure if urs has it but dont hurt to look its next to the cable for the actuator its a plug and goes in to the diff look at that hope i may have helped if u may now y my jimmy wont go out of 4wd lo hit me up thanks brian
  • prm1prm1 Posts: 4
    My 1999 GMC SLT 4wd crapped out on me tonight. A few good klunks and then I can barely move. Sounds like a gear is grinding, like it can't quite engage. If I am stopped with the brake on and put it in either drive or reverse, something starts turning and making the same grinding sound. My best guess is that it was coming from the rear, but it was also raining hard so I haven't had a chance to listen to it from outside.

    It has been making some occasional klunking noises the last few weeks. It has also developed an annoyingly loud whine that goes along with wheel speed, and isn't affected by turning, braking, accelerating or shifting. The whine may be a secondary problem caused by wheel bearings, UJs or the like.

    Any ideas? Transmission? Rear differential? Something else? I've got to tow it, so what kind of shop should I take it to? I'd take it home if it was something that could be rebuilt in place, but I don't feel like dropping a tranny. Any suggestions? I have been wholly unimpressed with the dealer in terms of both price and service (I am in San Diego).
  • Hi there, seems we all have similar problems with these GMC's ........ hoping someone can add some advice for me.
    1998 GMC Jimmy, 4WD, 3.8 V-6, Automatic Trans .......
    2 problems ....... replaced my transmission back in January .... it had been "banging" going into 2nd gear after driving a bit and everything was heated up, then began slipping and eventually went completely.Got a junk yard unit and installed and all was good for about 10 months ....... recently this transmission has begun doing the SAME thing ..... 15 minutes of highway driving usually and the first stop you come to ...... shifts VERY hard and bangs into second. Check engine light comes and goes. Someone told me there is a valve that sticks for the lock up torque converter and it needs to be replaced. Anyone have any experience with this problem?

    2nd ........ my 4WD operates however ....... there is ALWAYS vacuum applied to the vacuum cable actuator located under the battery. I removed the vacuum line for now so i can drive in 2WD and if I need 4WD I have to re-apply the vacuum hose.
    Does anyone think perhaps the 3 port vacuum switch located on the top of the transfer case could be stuck or damaged allowing vacuum there all the time? I have removed the connector and made sure it is on the right position. It is keyed so it would be difficult at best to put it on wrong. If this is a good possibility ....... is it difficult to replace by yourself or does this have to go to a shop? I saw the switch on line for between 25 and 35 dollars.

    Thanks all for any input I can get and good luck to you all!
  • Following up, it is definitely in the rear. It seems most likely to be coming from inside the transfer case. I tried putting it in 4lo and it would move, but would make a horrible klunk after 4 or 5 feet, and I could visibly see the rear axle (I was on the right side) move awkwardly when it klunked. That was my last test, and then I had it towed home.

    Does anyone know if that is something I could reasonably look at myself without a bunch of specialty tools? I have rebuilt several engines, replaced cv joints, rotors, and wheel bearings, but I have never cracked a transmission or a transfer case. Would you normally rebuild it in place, or replace the whole thing? Has anybody had to deal with this problem, to give an idea of the cost to repair?

    Thanks
  • check and see if you have the vac switch in the middle if the fire wall, my hose was broken there and lights were flashing.
  • Ok it was the intake gasket my husband replaced, not the head gasket..and then he found out why it was running rough...he accidently bent a couple of the "fuel injector jets"...fixed and now is well.

    As for the flashing lights for the 4 wheel..i'll have him check the vac switch as woodsman3 suggested. Thanks for the advice!

    Jenn
  • ok i have a 1992 jimmy and i cant get the 4x4 working and i was woundering if there is a way do engage it maunley
  • 3 button 4wd would not switch into 4hi or lo until the other day it went into 4hi and now it won't disengage... similar problem as others, lights on dash will just blink... spent hours reading forums trying to make sense of it all cuz i can usually teach myself how to fix things... so here is my progress and q's

    replaced TC switch on TC motor, the old switch was definitely shot and there is vacuum to the actuator under the battery tray, when the hose is disconnected the cable moves, afterwards disconnected the battery in an attempt to reboot the TCCM to no avail

    1. since the dash lights are responding correctly as to whether or not 4wd is engaged/disengaged does that mean the sensor on the front diff is working properly?
    2. because i have vacuum to the actuator then the lines should be good, right?
    3. where and what are any other sensors or switches i need to check?
    4. how do i tell if the encoder motor or the TCCM (i hear clicking when button on dash is pushed) is bad?

    any help is appreciated
  • dave, seems we have the same issue... just replaced the 3 port vacuum switch... to say it nicely it was a major pain... all it took was a 7/8 wrench but it was hard to see and to get to... its only $15 at autozone... maybe it'll work for you
  • ok so when i push the 4x4 button (two way button) nothing happens i can hear something clicking it sounds like its coming from the glove box area but it wont engage....so i put a junkyard actuator in it and it worked kinda the light showed 4wd but i dont think i was in it, the right side back tire would just spin so i played with the button repedly pushed it and know im back where i started and any one help me it starting to get frustrating.
  • I have similar issue my oo jimmy goes into auto 4 wheel when first started up, but as soon as u go around block service 4wd light comes on and auto stops working sometimes, local mechanic put on comp. and said rear actuator was bad which I think that is encoder motor but I thought encoder was only for 4 low engagement does this sound like axle switch or under battery actuator, or what, someone can help me? thanks chrome_eagle
  • I have similar issue my oo jimmy goes into auto 4 wheel when first started up, but as soon as u go around block service 4wd light comes on and auto stops working sometimes, local mechanic put on comp. and said rear actuator was bad which I think that is encoder motor but I thought encoder was only for 4 low engagement does this sound like axle switch or under battery actuator, or what, someone can help me? thanks chrome_eagle
  • I have similar issue my oo jimmy goes into auto 4 wheel when first started up, but as soon as u go around block service 4wd light comes on and auto stops working sometimes, local mechanic put on comp. and said rear actuator was bad which I think that is encoder motor but I thought encoder was only for 4 low engagement does this sound like axle switch or under battery actuator, or what, someone can help me? thanks chrome_eagle
13468915
Sign In or Register to comment.