I have a couple of friends with 05 Chevy Avalanches. they recently called me up regarding a problem with their 4wd.while driving the service 4wd drive will come on and then clear.We"re wondering if anyone else is having the same problem and what could this be. I know one of the guys his vehicle to the dealership and had an encoder motor or something replaced but it didnt resolve the problem. just thought we'd ask for a bit of knowledge on this matter.
I had the service 4 wheel drive message come up on my dash. Then my 4x4 switch would stop working. It would lock me it 4 wheel drive. But if i shut off the truck and restart it would start working agian. So finally i had the truck scaned and they told me i needed a new 4x4 switch. so i bought mid february one and so far so good. I was told that the switch is a very comen problem. I hope this helps.
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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
Well it could be the selector switch, but I doubt it. Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities. The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash. You should be able to have a shop scan the body computer for trouble codes and proceed from there. A basic code reader may not access the body computer.
if its electric shift. its probly the shifter motor. start vehicle open the door listen 4 the shifter motor. 2 see if you can hear it trying 2 shift. if not thats what it is if you can hear it tryng 2 shift it mite be vacume lines
I had that problem to last winter too. i took it to a shop and they told me it was the 4x4 switch. it is a common problem. I changed it and so far so good. It was an very easy fix. you just pop off the dash all the way around then you can take the switch out. there are two clips one on the top and one on the bottom. then all you half to do is un plug the wires and you are ready to put in the new one. it only cost me around $130.00 canadian.
a little tip a friend gave me in unlocking the 4wd drive on ramps or hill and then put in neutral let roll back a foot put in park and then let off the 4wd
when in 4wd the hubs get a little heated cause they need greased so they stick into position making it hard to come out of 4wd this which i spoke of i got stuck in the senerio where i almost drove home in 4wd from 300 miles away but i called my friend he told me bought this and so i thought it could help you
your hubs just locked up on you your bearings are going to need to be packed again this is normal for this
you will need to let the durango sit in the nuetral position without moving, then turn the knob from 2WD to 4WD. if that doesnt work, try putting the durango in reverse and then back to drive a couple times. you may have some mud/dirt/oil caked up under there interfering with the 4WD moving parts.