Question about 1999 GMC Jimmy

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4 wheel low works but 4 wheel high does not.

I bought a used 98 gmc jimmy and when i put the automatic transmission in neutral, then press the 4 wheel high button it does nothing nor does the little light on the button. but when i push the 4 wheel low button the 4 wheel low and high lights on the buttons both plash twice then the 4 wheel low button lights up and you can hear the 4 wheel drive lock into place. and then when i put it into drive the four wheel low works fine, then i put it into neutral again and push 4 wheel high and it kicks it out of 4 wheel drive back to 2 wheel drive. my buddy says its this electrical box right on the front pumkin that has gone bad and it costs around 25$. is this the problem? cuz i dont want to go buy something that is not the problem. thanks for your time. and if this is the problem can you direct me to a good parts place who will have this part on stock.

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  • milliardlou Nov 30, 2008

    well i went to autozone and the guy there said it was this thing on the side of the transfercase, it was on the driverside on top of the transfercase. the part i bought, it looked like a bolt that is hollowed out with a spring and ball inside it and on the other end is three plastic tubes at the end of it where the three vacuum hoses connect to and it did not fix the problem. the old one i took out the ball barely moved so i just left the new one in. another problem that i noticed was when i put it in 4wheel low is that the 4wheel low button did not light up and when i put it in drive the transmission only let me go 5mph at the most. so i kept pushing the buttons in and out of 4wheel low and then the 4wheel low button finally lighted up and when i put it into drive i could drive up to 35mph. does this mean something in my transfercase is not fully shifting it into 4wheel low? what could this be? the whole time 4wheel high still does not work and everytime i try to put it into 4wheel high the lights still flash and it kicks it back into 2wheel high. is it multiple problems? my dash buttons bad too? any info will be greatly appreciated. thanks

  • Anonymous Mar 12, 2014

    Sometimes when you push the button it will kick in other times it will not unless you disconnect to positive cable on the batters and then reconnect it

  • Anonymous Mar 14, 2014

    What does the N light mean on 4 wheel drive buttons



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  • 99 Answers

Sounds like the encoder on the side of the trans on the drivers side

Posted on Nov 30, 2008

  • jr0353 Nov 30, 2008

    you also have an encoder module that is located behind the ashtray. a scan tool will help identify the problem to start



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1 Answer

Four wheel drive stuck in neutral. Won't go into 2high or back to 4 wheel drive. Transfer case was replaced. Its a 2000 Jimmy.

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Only 4x4 high won't work 94 jimmy. It works in two wheel and in 4 wheel low just not high. It's a 94 jimmy, vanity wise it's mint. They're asking $1495, 200,000 mi. That seems to be the only problem and I...

Thats a fairly common problem with that model. Typically it involves a 75.00 part called a transfer case actuator. I personally think the price is right if the vehicle is in good condition other than the actuator. Be advised the Jimmy's normally came with a 700R4 automatic transmission that were prone to failure. Very expensive to repair 2200 to 2600. Mine failed twice before I sold it. Hope this helps. Marvin

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1997 GMC Jimmy, Won't go into reverse,but all other gears work,ok.

Check the automatic transmission fluid color.

It should be lite pink and there is ZERO odor of burn friction material.

TOP OFF is it's low on ATF


Have some one the check on the reverse light when you put the truck into the reverse gear.

NO reverse lights then the neutral safety is falling.


Check for free play on the gear lever. Pay close attention on the transmission end.

USE clear to remove excess dirt.


Inspect transmission pan and the floor for ATF leak.


Please rate my answer if it's helpful to you.



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4 wd low range will sometimes engage 4wd high will never engage

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I'm told and read a sun shell may be broke. Common problem for this vehicle. Shop will possibly rebuild and use aftermarket kit parts to correct problems the transmission had originally. Cost is probably between $1300 to 1600 to repair. Good luck I got the same problem on a 97 Jimmy and 3 shops said the same thing.

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