4wd issue

[Cjfrigo]

04 silverado auto z71

Was driving to my stand yesterday had to put it in 4wd push button everything worked fine.

Driving to a evening spot came to a mud hole that at the end starts up a steep side so i had to give it a little extra gas once through went back to 2wd service 4wd came on the dash . Tried pushing the buttons and nothing.

Now all the lights on the swtich work. When truck is off as soon as i turn the key and quicky push button i can hear it engage something underneath.

So far i pulled the switch and checked all the points in the switch for cracks, removed ground under drivers door and cleaned it, un hooked battery.

Light still came on

Now im left with the t case motor and the front diff swtich any insite to tell if there bad? Or which one.

5.3 4l60e

[newdude]

The system does set codes got anyone with a scanner that can read it?

[dorkweed]

FIFY!!!!! I sure hope you're old and wealthy..............because if you're young and poor.....................

04 silverado auto z71.

Was driving to my deer stand yesterday and had to put it in 4wd. i pushed the button and everything worked fine.

 

I was driving to an evening spot, and came to a mud hole that at the end starts up a steep side, so i had to give it a little extra gas once through it. I went back to 2wd, and the service 4wd light came on the dash. Tried pushing the buttons and nothing changed.

 

All the lights on the switch work. When truck is off as soon as i turn the key and quicky push button i can hear it engage something underneath.

 

So far I have pulled the switch and checked all the points in the switch for cracks, removed the ground under drivers door and cleaned it, and unhooked the battery.

 

The light still came on.

I'm now left with checking the T-case motor and the front diff switch. Any insight into how to tell if either is bad.

 

5.3L engine and 4l60e transmission.

[Cjfrigo]

I tried a regular obd2 scanner and no codes show.

Lmao I realize this truck isnt what i thought it would be

[kstruckcountry]

Most likely the tcase motor. Only the special scan tool a mechanic has will read the tcase codes. You can jack up both ends and put it in 4x4 and see what spins.

 

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[MikeNH]

You can't read secondary system codes without a special (expensive) scan tool.

[SpartanAutoworx]

Could be the encoder motor / encoder ring from what you have described.

[Dnt]

http://www.silveradosierra.com/how-to-articles/how-to-change-encoder-motor-sensor-t354818.html

[Knotsure]

Could be the encoder motor / encoder ring from what you have described.

If I had to guess I would second this opinion. I had a similar problem a couple yrs ago with my 06 Sierra 4x4. There are forums that will walk you through a repair step by step and you can get the ring sensor part on amazon for around $45. I think I used the above link and it was pretty easy.

 

 

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[GreasyHands]

Just FYI, I had error codes pop up "service 4 wheel drive" for years and after several attempts by the dealer and my own self diagnostics via pulling fuses etc, I finally took my truck to a well respected independent. He found the issue after allot of investigating.......the wiring harness going through the firewall was rubbing against the emergency brake support bracket under the dash and the wire going to the 4 wheel drive (brown I think) was "OCCASIONALLY" shorting against the brake bracket. Wrapped the wiring harness, diverted the harness as much as he could away from the brake bracket, no more problems. Just something to keep in mind.