Question about 1999 GMC Jimmy

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1999 gmc jimmy stuck in 4wd high

How can i get it back to 2 hi so i can get it to shop,pull fuse disconnect battery ect any ideas thanks

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  • protecservic Dec 21, 2008

    found problem after hitting large puddle water got inside actuator and messed up the encoder

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My 1999 GMC Jimmy is stuck in 4 low.

Posted on May 17, 2011

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I had this problem with the truck stuck in 4HI.... A temporary solution I found that worked was, along the driver's side wheel well, near the firewall, (between the wheel well and the brake booster) there is a vacuum hose that plugs into the vacuum reservoir in the wheel well.... By disconnecting this vacuum hose, I was able to get the front hubs to dis-engage, thereby getting me back to 2WD temporarily until I could get the real problem fixed.... In my case, I had two parts bad, the vacuum switch on the transfer case was locked up, and I had a bad vacuum actuator under the battery box.... But as I said, pulling that vacuum line should temporarily get you out of 4HI until you can fix the real problem... keep in mind, while this line is unplugged, your climate controls won't work, like to switch airflow from the floor vents to the defrost vents.... because they run on vacuum too, and with that hose disconnected, there's not enough vacuum pressure to run them (but also not enough pressure to keep it locked in 4HI, which is why this temporary fix works)

Posted on Mar 24, 2012

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If the truck is in four wheel hi it is drivable 4 low is not u can remove the drive shaft or actuator and switch it by hand it isnt easy but possible

Posted on Dec 20, 2008

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1 Answer

My 2000 gmc jimmy is stuck in either auto 4wd or 4wd hi, it won't go back into 2wd hi, the service 4wd light is lit on the dash, would you have any idea what the problem might be and how much it would cost...


Use the Owner's Manual to manually go into neutral and reset to 2WD HI. But then look under the hood check the fuses or look for wiring that may have come unplugged.

Oct 15, 2009 | 2000 GMC Jimmy

1 Answer

My 99 gmc jimmy has been locked in 4 high


try to disconnect your battery for about 5 minutes and then reconnect. it might help. I have the same problem with mine and it seems to help.

Jul 14, 2009 | 1999 GMC Jimmy

3 Answers

2001 jimmy stuck in 4wd low


Usually when a truck gets stuck in 4 low you need to put it in reverse, start backing up very slowly, put it in neutral (or push in the clutch on manual trans models) and stop the truck with the brakes. this will release the load on the gearing which should allow you to shift out of 4 low.

Feb 15, 2009 | 2000 GMC Jimmy

2 Answers

1995 gmc jimmy will not shift out of 4wd high


sounds like the vacuum lines are either pinched or the vacuum pump is shot. try getting a mechanic look at the lines on and around your transfer case... also try checking the fuses for the 4wd selector. let me know how it goes

Dec 26, 2008 | 1999 GMC Jimmy

1 Answer

Won't shift into 4 wheel drive mode at all / 2000 GMC Jimmy SLT


I have had the same problem with my 2000 jimmy. Disconnect the battery for approx 1 minute and then reconnect, this should reset the computer. It has worked for me every time. I was told it was a glitch with GMC.

Dec 24, 2008 | 2000 GMC Jimmy

2 Answers

1995 gmc jimmy 4wd high not working


sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Dec 22, 2008 | 1999 GMC Jimmy

1 Answer

Unable to put my 2001 GMC Jimmy in 4wd


fuse! I bet it is the fuse.does it flash and try to switch?

Dec 17, 2008 | 2001 GMC Jimmy

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