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
#376 of 396 Re: 1993 gmc sierra wont go into 4x4 [carlmiller138]
Oct 02, 2012 (7:22 am)
I'm having the same problem, i have already replaced the accuater and checked all the fuses and still does not engage
#377 of 396 Re: 1993 gmc sierra wont go into 4x4 [anims]
Oct 02, 2012 (9:26 am)
I have a '98 Dodge 2500. There is a "4x4 lamp" actuator on the passenger's side axle housing..this can and did cause the 4x4 to NOT engage. Then there is the actual actuator, vacuum operated, on the axle housing round with two hoses coming off it (again, on my DODGE) then there is the actuator on top of the transfer case that is also vacuum operated.
The vacuum lines must be put back CORRECTLY for the 4x4 to work !! There were 4 vacuum lines on my Dodge with the 241 New Process transfer case (same actuator as on the 231 t. case)
Check the vacuum lines for cracks, splits, holes, wear etc. and as you said, the fuses. Check all these. The electrical actuators, on axle and transfer case, were both around $15 ea. so I replaced both. Check all these again and see what happens.
#378 of 396 Re: 1993 gmc sierra wont go into 4x4 [anims]
Dec 04, 2012 (8:34 pm)
Iím no expert by any means; I can just tell you what I did to get my FWD running again. I have a 2000 Chevy Silverado, Extended Cab, and Long Bed with 180,000 miles. I bought the truck about one an a half years ago or so, and the FWD didnít work back then. So, last summer I started working on it. I did just as you have done, and looked it up on the internet. I went to a number of different sights hopping I could find a quick fix and save a lot of money. After reading I found things I could do with the help of youtube videos. I did the following:
1. Looked for a blown fuse. I only found one fuse that said FWD, and it was the one on the inside of the cab. Looked good. So that wasnít it.
2. Changed the selector switch. You know the push button thing, in the cab. This wasnít it either.
3. Changed the actuator. Nope not it.
By this time I was not too happy; therefore, I did the unthinkable, I took it to the Chevy Dealer. After all having a FWD truck, but the FWD doesnít work, just donít seem right. Kinda got my feelings hurt when they said ď$100.00 dollars an hour.Ē No thanks. So, I did without the FWD last winter. Luckily, it wasnít a bad winter.
So, before this winter, I was bound and determined to get it working come hell or high water the things gona work. After replacing all the parts last year and it still didnít work, I knew it had to be electrical.
I found a web site that has all the electrical information for my truck or any vehicle for that matter. Itís called alldata.com. Granted, I did have to pay like $25.00 for a year, but I did it anyway. And, low an behold, there is a fuse. Itís not labeled FWD, its labeled ATC. (Automatic Transfer Case) Itís under the hood with all the other fuses. So, I donít know what the actual problem was or how the fuse got blown, all I know is after doing all the steps above and replacing this fuse, itís working. I just had to try them all, I guess. Good Luck!!! And thanks everyone that posted on here. IT WORKED. I donít know which one done it, and donít care. I got my FWD back.
#379 of 396 Re: 1993 gmc sierra wont go into 4x4 [titen]
Dec 07, 2012 (3:58 pm)
Hey Thanks for sharing especially about the ATC fuse. My truck has been sitting for 2 years . After reading your blog i went out and it was the ATC fuse. i changed it and the truck works after being stuck in 4 low....I looked 2 years ago and all the fuses for 4x4 were good. but i never knew to look at the one labled ATC.. You are the Man!!!! T hank you so much..Steve
#380 of 396 Re: Robalmighty [robbint]
Dec 24, 2012 (8:30 am)
Hey i just wanted to know if you fix this problem i have the same issue driving hit a bump or roll down hill 30mph rmps drop and fall out of gear, i have to stop hit 4wd button hard clunk and back to 2wd and iam off again.... PLEASE any help would be appreciated.....
#381 of 396 Re: Robalmighty [djgorillaman]
Dec 26, 2012 (10:53 am)
If there is anything we can look into for you (warranty/recall questions, follow up on an appointment with a dealership), we can be reached at socialmediagm.com (include a brief summary, the last 8 digits of your VIN, and your name and contact information).
Sarah, GM Customer Service
#382 of 396 Re: 2003 sierra 4x4 probs [bruce48532]
Feb 02, 2013 (5:31 pm)
Just replaced my encoder motor after reading this thread given your description of the problem. My truck would not shift out of 4wd until a hit a big bump or put it into park then reverse. I had a grinding noise, slipping of the transmission when I gave it gas and pulling to the right (under throttle). It is now working like a champ again! Thanks!
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.