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2007 Sliverado won't go into 4 hi or AWD
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MarineGrunt
Enthusiast
Mar 2, 2013, 5:26 PM
Post #1 of 11
(1740 views)
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2007 Sliverado won't go into 4 hi or AWD
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Today I helped a buddy put the wear plate in his transfer case. It's a 2007 Silverado 1/2 ton 5.3 4X4. All we did was split the case, pulled the pump, attached the wear plate, and put it all back together. We did not pull the encoder motor off so it was attached the whole time. When I did mine I seemed to have a similar problem but mine wouldn't go into AWD or 4 low. I think the next day I went to check it and all was fine. Does the computer just need some time to reset itself? I just don't see what we would've done to where it wouldn't work right. We didn't mess with any internals that would affect it. All wiring harnesses are hooked up correctly. On two harnesses that are the same only reach to where they connect. We labeled the speed sensors but I don't think they would even matter with the problem we're having. Hopefully the bug will work its way out on it's own like it did on mine.
Any thoughts or ideas?
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nickwarner
Veteran
/ Moderator
Mar 2, 2013, 6:11 PM
Post #2 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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It would help if you had access to a scanner that could pull codes and data from that module.
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MarineGrunt
Enthusiast
Mar 2, 2013, 6:39 PM
Post #3 of 11
(1721 views)
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Re: 2007 Sliverado won't go into 4 hi or AWD
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When you push the button you can hear the motor turning trying to lock into 4 hi or AWD and the light for the button you push also flashes. You just don't hear the "clunk" like you do when it finally engages. The light then returns to 2 hi.
I need to call my stepdad. When we did his a few months ago his wouldn't go into 4 lo afterwards. Like I said, mine did the exact same thing. Mine started working the next day. I'm not sure if my stepdads starting working or not.
I'm not sure if my buddy who works for Altorfer and works on cars on the side has a scanner that can pull codes from that module but will check. It's like a $3500 scanner but is probably 8 years old. That would be my only shot without taking it in. I just hate that I tried to my buddy a favor and now this. I really think it will "reset" on it's own. I was just hoping it could be confirmed.
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speed
User
Mar 2, 2013, 7:26 PM
Post #4 of 11
(1716 views)
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Re: 2007 Sliverado won't go into 4 hi or AWD
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well i know those encoder motors are notorious for going bad. I see them pretty often at the dealership and my parents 04 suburban is having the motor act up on and off so it might have just finally gone out.
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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MarineGrunt
Enthusiast
Mar 2, 2013, 7:48 PM
Post #5 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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Thanks Speed.....he had it in AWD the second before we started pulling the transfer case so was working fine. What are the chances? I guess I could pull the encoder off of my truck and try it on his. Mine is an 2003 Sierra but I believe it's the same on both trucks. We both have the 246.
If I do swap them to see could I just pull the black cylinder off and swap it instead of pulling the whole thing off? When I removed mine to do the transfer case pump rub plate I had trouble getting the larger tooth on the gear lined back up and would rather not screw with that if I didn't have to.
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speed
User
Mar 2, 2013, 8:17 PM
Post #6 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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Im not sure ive always split the case to replace em and usually do the gear with it. I would say its the same and yeah they work fine and the next second they dont not sure what is i just know they go bad often, yeah they can be a pain but i believe that black plastic is just a case and you have to split the case to actually change it. And theyre EXPENSIVE i just did a price check today and the new one was 400 i think maybe 500 and a remanned is like 300
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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MarineGrunt
Enthusiast
Mar 2, 2013, 9:31 PM
Post #7 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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I was looking at alldatadiy and in the troubleshooting it mentions to remove the encoder motor and check to make sure the shift lever detent shaft isn't binding. I'm wondering if that when we split the case we didn't get it seated properly into the little hole on the rear housing. Either that or something didn't seat properly when we reassembled everything. I wouldn't think the case halves would go back together if something wasn't lined up though but I'm no pro. I guess for now the best thing to do is wait until tomorrow and see because I had the exact same thing happen. When I finished mine all of the buttons wouldn't engage. I woke up the next morning, tried it, and it was all good to do. I guess all I can do right now is keep my fingers crossed. If it were my truck I wouldn't worry about it as much. I just feel bad because I helped a buddy out and now this. Hopefully I'm worrying for nothing though.
If it's not working as it should tomorrow I think I'll swap the encoder from my truck. If that doesn't work I think I'll drop the t case again just to make sure everything inside is good to go and lined up. If that doesn't do it I think I'll tell him to take it to the dealership so they can hook a scanner up to it. I'll keep you posted.
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MarineGrunt
Enthusiast
Mar 5, 2013, 6:03 AM
Post #8 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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Here's an update. I climbed under the truck to recheck electrical connectors. They were good and the wires can only reach to their original location. I pulled off the rubber boot that covers the snap ring that you have to remove when splitting the case or assembling the case halves. There's a groove in the rear housing that the snap ring fits in. There's then a groove in the output shaft. When you put the case halves there's about a half inch gap until you spread the snap ring. You also have to stick a screwdriver through the speed sensor hole and kind of pry on the output shaft. Well, I think that when the case halves drop together I just kind of assumed the snap ring was where it was suppose to be. I was able to see with a mirror and flashlight and the snap ring is out of the groove on the case and a lip on the output shaft jammed the snap ring. I think the snap ring is still in the groove at the very bottom of the case halves. I was able to move the snap ring at all so will have to drop the case again. We're gonna do that today. I'm just surprised it would even go into 4 lo. I'm just glad it wouldn't go into 4 hi or awd also or else I would've thought everything was okay.
I can't believe I didn't check the snap ring. When I did mine I remember having to give the snap ring another nudge. I guess that's the way it goes sometimes. At least there was damage done. I'll post the results once we're finished but this has to be the problem.
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MarineGrunt
Enthusiast
Mar 5, 2013, 5:25 PM
Post #9 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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That ended up fixing it. What a stupid mistake. It had to have been partially in place or I don't believe the case halves would've dropped together but I should've known better than to not turned the snap ring to make sure it was seated all the way around. So, if you ever get someone that says they installed the pump rub kit and it will only go into 4 low, and not 4 high or AWD, tell them to take a mirror and make sure that snap ring is in the grooves in both the rear housing and the output shaft. You must need that little bit of play in order for it to engage. Either that or with the output shaft being jammed against the snap ring something doesn't quite line up and the system realizes something is wrong mechanically so it doesn't allow it to engage. Well, at least it was an easy fix.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 5, 2013, 6:17 PM
Post #10 of 11
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Re: 2007 Sliverado won't go into 4 hi or AWD
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Don't beat yourself up over it. It happens to the best of us. That is one way you learn in this trade, from making mistakes. You just don't want to make ones that can kill someone. Glad to see you got it figured out.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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MarineGrunt
Enthusiast
Mar 5, 2013, 9:17 PM
Post #11 of 11
(1638 views)
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Re: 2007 Sliverado won't go into 4 hi or AWD
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Well, that wasn't as bad as me forgetting to put the castle nut back on the ball joint of the Venture when I replaced the front left hub! That happened a few days ago. Luckily I just backed it out of the garage, went to pull forward, and then heard the most God awful fastest clunking I have ever heard! The cv shaft was toast. To make me feel better I got together a bunch of parts that needed returned, went to the parts store, got the shaft plus $41 back. I'm usually anal about stuff and triple check everything. I normally catch my mistakes before everything is back together. Not sure where my mind has been over the last few days. Like Nick said though, it could've been worse. At least it happened in my driveway and at least it was my vehicle and not a customers (not that I really have too many but do work on friends and family member's vehicles at times). The shaft was so roached I couldn't even move the van to the side. It had to block the driveway until I fixed it.
What bothered me about my buddy's truck was that it was someone else's truck. If it were mine, oh well. He's happy though. He doesn't know squat about cars and we saved him a bundle. We also did his u joints today.
Live and learn I guess.
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