Question about 2000 GMC Yukon

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Changed the actuator on my 2000 sierra but the service 4wd light

The service 4wd light on dash is still on can any help please

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Have you reset the computer?
If not,you need to diconnect the battery for a few minutes.

Please rate this solution.

Posted on Jan 17, 2009

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Posted on Jan 02, 2017

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1 Answer

2007 gmc 1500 4wd not working. service light on and lights on switches are off. truck in 4 low


Sounds as if the transfer case control module has gone bad and grounded the circuit to the 4 low actuator. The module is located behind the headlight switch in the dash. You could try tapping the actuator on the transfer case lightly with a hammer to see if it releases.

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Service 4 whell drive on dash I replaced front actuator and encoder motoron gmc sierra but still no 4 wheel drive I also changed the dash switch all fuses are good what ami missing?


The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.
I have found out that usually the two ground wires that are attached to the frame right under the front of the driver's door is the culprit that causes the 4wd selector switch in the dash to go bad. Chevy had the bright idea of applying the undercoating and/or not cleaning the point of contact of the ground wires before they bolted them to the frame therefore overtime moisture, dirt and corrosion affects the contacts of the threads of the bolts which are the only source of ground the two sets of wires have. There are 2 things you will need to do. First you will need to take the bolts out and use a wire brush to clean down to the metal of the frame as well as the bold threads and ends of the wire attachments and then reattach the ground wires to the frame (time to complete - less than 5 minutes). Second you will need to replace the 4wd selector switch in the dash. You can purchase this online from Amazon (Dorman 901-062 4-wheel drive switch for $31.15 - no tax or shipping and handling). To replace, gently pull the outer trim of the dash out by using just your fingers. You do not need to completely remove it, just pull it out far enough so that you can pull the old switch out of it slot. Then unplug the two plugins located in the back of the switch. Plug them into the new switch and push the switch back into the slot and then push the trim back into place (time to complete - less than 5 minutes). This should take care of your problem. Most often, people make the mistake of just switching out the dash switch and when that does not correct the problem they then replace the more expensive and time consuming actuator motor and location indicator on the transfer case that does not need to be replaced. I should point out that when the Service 4WD light comes on

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2000 gmc sierra 4wd wont engage, buttons on dash just blink


It's probably the 4X4 actuator, (stepper), motor on the transfer case.

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Service 4wd light is coming on but 4wd works fine


i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

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try reversing six to eight feet after shifting into 4WD. PLEASE RATE MY ANSWER.

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The problem is with the front actuator.Its flashing in the dash lights because is not functioning properly.Replace actuator and fix problem.Its a 4 or 3 wire screw in plug in front axle,,

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