Jump to content

Unfixable 4wd!!!

catphe10

Recommended Posts

catphe10 New Member

catphe10

Posted
Posted

hello all,

I am sure this issue has been beat to death multiple times, but I cant find the answer.

I have a 2005 Silverado 1500 z71, I have had this issue for about 2 years now. the issue being that no matter what part I replace my 4wd wont reliably work.

here is a list of what parts have been replaced.

Drivers side wheel hub- twice

Passenger Side wheel hub- three times

Diff. actuator- twice

4 button switch on dash- once

TCCM- once

Transfer case motor- once

 

So what is happening is, the dash will read service 4wd, i have taken it in to a shop where they have been replacing the parts, and i have come to the conclusion they are just throwing parts at it to find a fix. Every time they would replace a part it will work about 2-3 days but then give me the same service 4wd message. if i push one of the 3 4wd buttons on the switch the light will blink for a while then stop and it seems like it doesn't shift into 4wd. But i have crawled under the truck while someone else selects a 4wd button, I can hear and feel the transfer case changing into to 4wd mode. but the front diff actuator does not engage. I have checked and cleaned the ground wire under the drivers door twice but that doesn't seem to help. I am done throwing money at the shop to fix it, so this is my last resort.

 

any help or ideas is greatly appreciated,

Thank you,

 

 

 

dwntwnbrwn1985 New Member

dwntwnbrwn1985

Posted
Posted

Okay, this topic has been haunting me as well for the last 2 months as well and if it weren't you, it would be me asking. I have a 2003 1500 and I would be curious and eager for the replies. Dunno if this  might be able to help, but i will be doing this myself today to rescue my rig from the newly fallen snow in my area. At the front diff. actuator connector (plug), check with a multimeter to see if there is 12v is going through that connector. I ended up purchasing a new front diff. that came from a similar year Tahoe, slapped it in, just to find out while draining that there was a significant metal buildup on the drain plug and had me worried. Swapped axle plates, then yesterday the actuator. It was worthwhile since it would buy me time to  learn and research how to rebuild the original. Next was going to see if i messed the wires on that plug since i cant hear the actuator engage either. If that doesn't work, i thought about somehow manually engaging the actuator in a lock position since really that actuator only moves an inch or so to depress that spring on the inside of the diff. to lock it. I dunno if that will work but I'm out of options too and more snow to come!

  • 2 months later...
Silverado23 Enthusiast

Silverado23

Posted
Posted
On 2/11/2019 at 9:59 AM, catphe10 said:

hello all,

I am sure this issue has been beat to death multiple times, but I cant find the answer.

I have a 2005 Silverado 1500 z71, I have had this issue for about 2 years now. the issue being that no matter what part I replace my 4wd wont reliably work.

here is a list of what parts have been replaced.

Drivers side wheel hub- twice

Passenger Side wheel hub- three times

Diff. actuator- twice

4 button switch on dash- once

TCCM- once

Transfer case motor- once

 

So what is happening is, the dash will read service 4wd, i have taken it in to a shop where they have been replacing the parts, and i have come to the conclusion they are just throwing parts at it to find a fix. Every time they would replace a part it will work about 2-3 days but then give me the same service 4wd message. if i push one of the 3 4wd buttons on the switch the light will blink for a while then stop and it seems like it doesn't shift into 4wd. But i have crawled under the truck while someone else selects a 4wd button, I can hear and feel the transfer case changing into to 4wd mode. but the front diff actuator does not engage. I have checked and cleaned the ground wire under the drivers door twice but that doesn't seem to help. I am done throwing money at the shop to fix it, so this is my last resort.

 

any help or ideas is greatly appreciated,

Thank you,

 

 

 

They’re trying to replace my tcm as well which will run 950-1000 I don’t have the money for that and I haven’t had any indications for a bad tcm any updates

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      The Peckish Synapse

      By KARNUT · Posted

      If it has a stick I can have fun with it. When my wife first got her Acura years ago I used to tease her about it. I was only interested in muscle cars. They’re gone now. So once a month I drive the Acura. Every once in a while I’ll take it to Redline. But just normal driving on some twisty back roads usually does the trick. 
    • contrabombarde
      2010 Avalanche 5.3 not running correctly after engine swap.

      By contrabombarde · Posted

      I went through again with a test light and everything checked out.    I suppose it could be the MAF itself but I've tried 3 different sensors, 2 of which were in running vehicles previously (the one in this truck, and the one in the donor truck), as well as a new one I picked up from NAPA. I would just be surprised if all 3 were bad.   EDIT/UPDATE: I swapped in the MAP sensor that was originally with the 2010 PCM, that made the code for map sensor voltage high Go away, and the map sensor seems to read normal with key on engine off (14psi or so), but it still doesn't run and does the same thing as before.
    • Atlas
      No Software Updates - Old Build

      By Atlas · Posted

      In addition to a cell or wifi connection, the infotainment needs to be enabled to download software updates. That's a toggle within the system settings.   But...if the truck was prevented from receiving updates in a past life, missing a bunch of updates may mean it won't go back and download all of those because they're not available or the system is too far out of date.   If a formal recall depends on a software update, the recall for that truck remains in an open status until it's applied. The dealer would need to apply the software update in that instance.   Most updates downloaded and applied via the infotainment aren't recalls/safety recalls, they're enhancements and usability fixes which aren't critical.
    • Vu1can
      Brake Pad Warning Message

      By Vu1can · Posted

      Recently I've been getting a message, "New Brake Pads Detected. Reset Brake Pad Life?", But I haven't had the pads replaced and the truck only has 28,000 miles. The Brake Pad Life shows Front 64% and Rear 79%. I select NO to resetting the brake pad life and the message goes away but comes back at the nest restart.   I stopped by the dealer and was told that it sounds like a software glitch that would require reprogramming. Even though I have the extended warranty, they tell me that reprogramming is not covered unless a module was actually bad and needed to be replaced. Simply reprogramming is not covered. So, they want $200.00 just to diagnose the problem. If it turns out no bad module, another charge on top of that to do the reprogramming. If the cause was an actual bad module, everything would be covered under the warranty.   Just wondering if anyone else has had this problem. Should this issue be covered under the warranty?   Thanks
    • newdude
      Tire psi

      By newdude · Posted

      NHT is diesel only, correct.     The GVWRs for NHT on 3/4 ton bring them to the same numbers as many of the 2WD 1 tons.  A crew 4x4 standard 3/4 with NHT is 11,750lbs, a 1 ton same cab/box/4x4 is 12,100lbs.     Hubs and hub bearings are the same for 11.5" and 12" axles.  Housing, diff carrier and ring/pinion are larger for the 12".   All gas use the 11.5" axle, 3/4, 1 ton and 1 ton DRW. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...