Last post on Nov 27, 2013 at 8:15 AM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck
Feb 09, 2013 (6:03 am)
I have a 2006 4x4 silverado ext cab and when I have it in 4x4 auto and turning on dry pave it seems to bind up like it is in 4x4. I thought that when you are in auto 4x4 it is only suppose to be in 4x4 when the wheels spins, My truck has been doing this sense it was new, is this normal?
#384 of 396 Re: auto 4x4 [waffie]
Feb 09, 2013 (10:20 am)
Did you ever get this checked into by your dealership while it was under warranty?
Sarah, GM Customer Service
#385 of 396 Re: 96 chevy silverado 4x4 problems [96chevy4x4]
Jun 17, 2013 (8:52 am)
The actuator is a ground side switch and is one of the last ones in the circuit. Make sure you are getting power out of the fuse first. The transfer case switch is the first switch in the circuit. When you switch to 4wd the t-case switch closes and that sends power to the actuator. Check the t-case switch (you can run a jumper wire and see if the 4wd engages then). There is a chance that the new actuator is bad but that is a very low chance. Check power and ground first, then start checking the switches. And since the floor shifter starts the process check any wiring/switches, or hoses associated with that to make sure it's not causing the actuator not to work when engaged. Like a short or something. Make sure you have ground at switch.
#386 of 396 Re: 2005 Silverado 1500 [vinceblas]
Jul 14, 2013 (9:19 pm)
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, there are no codes that show up on the code readers which is awful strange in its self. I hope this helps everyone with this problem because I sure wish I knew this before my many costly and time consuming trips to multiple repair shops including the dealer and none of them were able to successfully repair the problem. It sure seems like Chevy could release a repair bulletin so that everyone could fix Chevy’s blunder. I bought my 2005 Silverado new in September of 2005 and this has been the only major problem I have every had with this truck with the exception of the check engine light that came on this past spring and the error code was P0446, which was the Vapor Canister Purge Valve. They have since come out with a new conversion kit that cost close to $100.00 and is very time consuming to replace. I highly recommend that you can purchase the original equipment part from Amazon – ACDelco 214-2147 OE Service Vapor Canister Purge Valve for $16.36. You will have to cut the vent tubing right at the old canister and use a 2 inch long piece of vacuum tubing the next size up to attach the new canister because the original tubing is hard and cannot be stretched to remove on to reinstall the new part. The canister is located at the back of the gas tank and can be accessed without having to even jack up the truck. It clips right onto the back of the gas tank and has one plug in going into it (time to complete – less than 5 minutes). Best wishes, Mike Gilbert, St. Joseph, MO
#387 of 396 4x4 wont work
Aug 19, 2013 (4:02 pm)
is their any body out there that can tell me how the 4x4 system travels direction wise when it leaves the switch on the dash. When I turn the ignition on allthe lights come on then they go off. You can push any button but nothing happens.
#388 of 396 06 Silverado 4x4 must drive in auto 4wd
Aug 26, 2013 (2:47 pm)
#389 of 396 06 Silverado 4x4 must drive in auto 4wd
Aug 26, 2013 (2:47 pm)
Aug 25, 2013 (5:55 pm)
I didn't see this issue posted. My 4wd must stay in Auto 4WD. If I put it in 2H it goes thru the gears and when it hits 4th gear it drops to neutral. I am unable to drive in anything other than Auto 4WD. The last time I used the 4WD function was approximately 5 months ago and I don't recall putting it in Auto 4WD. I have very little call for the 4WD but I like knowing I have it. I recently went from NM to KS without realizing it was in auto 4WD. That was when I found that
the 2H wasn't working. Any ideas? I am unable to locate the ATC fuse that one message discussed. Not even sure this would fix the problem
#390 of 396 Re: 06 Silverado 4x4 must drive in auto 4wd [pwitty]
Oct 21, 2013 (11:53 am)
I am experiencing an absolutely identical problem (with an identical truck) to yours (mine has 80K miles). I am therefore keenly interested in what you may have found out. The local chevy dealer has suggested over the phone that my transfer case had been run without oil perhaps, and that simply was NOT the case, it is full of clean oil with no burned smell or other signs of neglect. Now he wants me to bring the truck into the shop and start emptying my pockets so to speak $75/hr.
Can anyone help me out with advice?
#391 of 396 Re: 06 Silverado 4x4 must drive in auto 4wd [ldl3]
Oct 21, 2013 (12:07 pm)
Did you do as I suggested? Did you look at your ATC fuse? That was the problem I had, so I just replaced the fuse, And it's working now. The ATC fuse is located under the hood of the truck in the fuse box. to locate the fuse look on the legend on the back of the cover, and it will tell you the exacted one. Should be a 20 Amp fuse, if I remember right.
#392 of 396 Re: 06 Silverado 4x4 must drive in auto 4wd [titen]
Oct 22, 2013 (6:19 am)
There is no fuse marked ATC in any of the 3 fuse blocks (underhood, center, & instrument panel). There is a 25A 4wd fuse in instrument panel block, it is fine.