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2004 Silverado 2500, non HD, Autotrac t-case Not getting

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2004 Silverado 2500, non HD...
2004 Silverado 2500, non HD, Autotrac t-case
Not getting power to the 4wd buttons on the dash. Replaced the dash buttons, replaced the 4wd actuator motor, still nothing
The truck would start off in 4wd low, on it's own, I could put it in neutral, shift to back to 2wd, and all was good.
One day it said service 4wd, and the buttons stopped working, that was a year ago.
Submitted: 1 year ago.Category: Chevy
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Customer reply replied 1 year ago
The tcase is now in neutral, it's no longer in 2wd
Answered in 3 minutes by:
11/27/2015
Chevy Mechanic: Greg Jensen,
 replied 1 year ago
Greg Jensen
Category: Chevy
Satisfied Customers: 16
Experience: Master Automotive Technician at Blade Chevrolet
Verified

Hello my name is***** are multiple service tsb's for differnt codes in these systems. Have you had it scanned at all yet by chance?

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Customer reply replied 1 year ago
no I have not. I have HP tuners, but it does not show anything from it
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

It sounds to me Like the module may be the issue esp sense you already replaced the encoder motor and the switch assemble. you could try next to remove the fuse for the tccm, It is located In the underhood fuse block. remove it for a few mins then reinstall it to see if it will at least function again. there are several updates that gm has for your tccm for these type of issues, however, If you have code c0550 stored we know the module will need to be replaced. Also this module has to be programmed to your vehicle. So, it would require a dealership visit.

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Chevy Mechanic: Greg Jensen,
 replied 1 year ago

I looked I may be incoorect the fuse my be inside your I/P fuse block which is on the L/H side of your dash.

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Chevy Mechanic: Greg Jensen,
 replied 1 year ago

It should be labeled 4WD

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Customer reply replied 1 year ago
I checked the 30amp fuse under the hood, marked as TREC, and its good.
There's no 4wd fuse on the drivers side fuse box in the cab
Customer reply replied 1 year ago
I now have a tech2 MDI and a Matco MaxMe scannersnothing for the TCCM has showed up anywhere
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

Did you try removing the TREC fuse and letting the module power down?

I looked at the schematic that should be the correct and only fuse and based on your saying that you have no comm with a tech2 for the tccm. You next can check the power and grounds to the module before replacement.

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Customer reply replied 1 year ago
i have tried pulling the 4wd fuse under the hood and the TREC, and waiting 30sec and tried to read for codes, and there was no change.
I picked up a new harness, 15895628 and I'm going to try that next
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

we can prove if it needs a module pretty easily by just doing a few checks of your powers and grounds and data comm ckts at the tccm. if you have power and grd/ good conn on the data line. then you have a bad module and I have replaced alot of those modules.

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Customer reply replied 1 year ago
well the new harness didn't make a difference.
I have a New TCCM, it's been plugged in before with no changes.
I now have a new dash switch, new actuator, new tcase harness . . . still nothing
If I plug in the new TCCM, still no power on the dash buttons.
The old TCCM had no evidence of water issues
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

Have you checked checked your powers and grounds at the tccm?

DO you need that schematic?

What op code is your system, you can find the op codes of the vehicle in the glove box on the white sticker. its either np1,np2,np3 or np8?

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Customer reply replied 1 year ago
sir, I have checked the ground and power going to the TCCM. The ground and orange (always hot) are good.
I have the NP8I'm now wondering about the wake signal wire, where is it and is it a ground or hot wire. . . . ?I'm open to any and all suggestions that you might have.
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

Im in it to win it so WE will keep grinding on it. Go to the switch it self and check on connector 1 spot G should be a brown wire, check it for power with the ign on.

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Customer reply replied 1 year ago
connector 1, post G - hot at ignition - it's good
Customer reply replied 1 year ago
Im assuming that I'm testing them for continuity ?
Chevy Mechanic: Greg Jensen,
 replied 1 year ago

yes, just trying to cover our basics

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