Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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?
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.
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.
It should be labeled 4WD
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.
It is sounding more and more like you have a bad module. you Might want to check for this issue as well.
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.
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?
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.
locate splice pack 205. its hard to find but its under the l/s of the dash here is a pic.
then you can disconnect it and check the data line to the tccm.
You can see the tccm is also in conjunction with the ebcm, so you might want to make sure you have good comm with the ebcm and if you do that tells us the the data lines working from the splice pack back.
Here is this sch as well if you dont have it.
yes, just trying to cover our basics