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Re: 2000 gmc 4 wheel drive
Look in your fuse box for the bcm fuse (body control module) and remove the fuse atleast for a mint and then start the vehicle, put it in neutral and disengage the 4L and you are done once it is disengaged turn the vehicle off and re-insta the fuse yo pulled out and you should have no problem.
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Put truck in park,put into four wheel hi, then throw truck in reverse and drive backwards 200 feet,then drive foward. if dont work, you could try to leave truck in park and 4 wheel hi, then disconnect battery for 15 minutes then reconnect battery. doing this will reset the computer.
asker: Also, it helps if you're rolling at about 2 mph with the steering wheels straight. You cannot shift into 4LO with the wheels turned or when in a drive gear. Also, it may be that you need the electric shift unit serviced. It is not recommended to drive on dry pavement while in 4LO.
Try starting the vehicle , place the emergency brake on , switch from drive to nuetral. with engine running try to move the 4wd handle. If your handle moves in and out of 4 wheel drive and the selector handle moves into 2wd you need to drive the vehicle to get it out of 4 wheel low otherwise the 4 wheel drive solenoid may be stuck . This is located on the front axle . round with a vacuum line coming off it. Check the vacuum line at the solenoid or it may be the solenoid. Gook luck with your fix
hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental
If you have tried shifting stopped and moving, then I'd say the transfer servo could be broken. It is the motor on the transfer case that shifts it in and out of four wheel drive. If you know how to use a voltmeter, test the wires that run to the servo to see if it is getting the signals it should be. Newer vehicles usually have a computer associated with the transfer case motor. You could have the car plugged to a tester at auto zone to see if it is giving a code.
i found the problem it was the acuator on the side of transfer case so i took it off and manualy put it in 2 wheel drive now all i have to do is get under there and turn it with a tire iron thanks but got it under control......