Question about 2000 Chevrolet Blazer

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My 2000 Chevrolet Blazer is stuck in 4low. Today my "service 4wd" lit up on my dash. I asked a friend to check it out really quick. He tried putting the car into auto 4wd with my push button switch over located above the radio. It wouldn't switch into auto 4wd but it switched into 4 low. when we tried to switch back it wouldn't go. The 2 hi button would just flash like it was trying but couldn't. I decided to drive it down our street to see if it would switch being in motion. well now it will not falsh at all. None of the buttons will do anything except the 4 low button is lit up saying I am currently in that spot. Is there any tricks or ideas of how I can get my truck back into 2hi from 4low? Please and THANK YOU

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At the bottom of the transfer case is a big hex cap. Unscrew this till the oil just starts to drip. Inside is a spring and a ball that gives positive positioning on the shift fork rod, this sometimes gets stuck. While loose almost off shift to 2wd and you should be good. This will happen until fixed so dont use 4lo until fixed.

Posted on Jun 07, 2010

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Start with the simple and check the fuses and replace any one that has gone bad. Pay attention to the 4WD fuse and replace it is it has gone bad.
Thank you for using fixya and keep me posted, be glad to help you get your Blazer running 100% again soon.

Posted on Jun 02, 2010

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1 Answer

What is wrong with my 2000 chevy blazer ; it is a 4wd automatic an i locked it in 4wd low to pull my boat out of the water and can not get it to shift back i to 2wd?


You shouldn't have to use 4wd to tow a boat out of the water. Does your truck have a 2wd button or just the 4high and 4low button? If you have a 2wd button, put tranny in neutral and then hit the 2wd button. If you just have the 4high and 4low button, put the tranny into neutral then press the 4high button twice (Once to get back into 4high, then again to get out of 4high and back to 2wd).

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Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.

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Hi i have a 2000 Chev Blazer, the service 4WD light appears now and then , we never use 4WD so was not worried about it until today i tryed to put into 4WD and it would not work the lights on the buttons...


one of my vehicles is actually a 2000 blazer and i had that same problem believe it or not. you should check all the connections to the brain of the 4wd. take off the passenger side right side kick panel. the kick pannel is that piece on the side right there next to the door. take that off and you will see a grey box. pull the wires out and look at the ends. i cleaned mine out with a q tip because there was crud in one of them which screws things up. if that doesnt fix it you may need a new one. they can be really expensive from a dealer so i went to a wrecking yard and pulled one out of another blazer and it only cost $20. it works fine now :) i hope that helps.

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It should tell you on the Shifter whether or not that you can Shift on the Fly. Check the Manual first if there is one in the Truck. Some Models had this and some Did not. Was an Extra from Factory Option.

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first the flashing light means that it is trying to go into 4wd. as far as i know there is no adjustment. The shift motor may be bad, If the transfer case is shifting it could be the silinod in the front differantal.

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