TCCM Replacement How To

[Vartz04]

I purchased my TCCM from GM Parts Direct. It cost about $200 Shipped.

Here is how you replace it.

First take off the panel under the steering wheel and the pannel that is below that



This is what you will see from under neath the blue clip goes into the TCCM there are 3 different plugs that clip in there. It is right behind the metal plate that you will see when you take off the pannel, It is all the way to the drivers side.


These are the 3 plugs after you take them out of the TCCM They unclip pretty easily but require a little contortion to get your hand up there to them. I am sure you could just take more stuff off but this wasnt too bad.



This is how they go in the TCCM. Note, you cannot put them in before you pop the new TCCM into its bracket. This is just so you can see the order of the plugs because you won't be able to read the label on the TCCM when you put it into place.



Clip the TCCM into its bracket, and install the plugs. The small black plug goes all the way to the passenger side, I labeled them in the drawing.



Put the dash back together, go to the dealer and get it programed.


any questions just ask here, don't PM me

[SweetD8943]

Great info - thank you so much for posting the process.

Any trouble driving the vehicle after swapping the TCCM out?

If you can - let us know what they get you for ($$) to do the re-programming of the TCCM at the dealership.

Thanks again - exactly what I needed to get this thing replaced on our TB.

Dave

[gordinho80]

TCCM needs to be reprogrammed? I had an issue with mine a few months back. I was getting the Service 4WD light and the switch didnt have any indicator lights on. I swapped out the TCCM with one from ebay, No Problems since... never went to dealer...

[SweetD8943]

Mario,

Someone, somewhere had mentioned that you do not need to get the newer, redesigned TCCM "reprogrammed" - whatever they did with the redesign eliminated the need to reprogram...not sure, but it sounds like it worked for you.

It will be interesting to see what they tell Vartz04 when he goes to the dealership...thanks for the input!

Dave

[480-Pelle]

Originally Posted by gordinho80

TCCM needs to be reprogrammed? I had an issue with mine a few months back. I was getting the Service 4WD light and the switch didnt have any indicator lights on. I swapped out the TCCM with one from ebay, No Problems since... never went to dealer...

So did I, installed a -04 TCCM on my -02 TB...no problem.

//Pelle

[Vartz04]

well I took mine to the dealer, they said they cannot communicate with the replacement. So something else is up I guess.

[SweetD8943]

Hey Jeff -

That sucks. Question: Did you ever get a trouble code reading for the TCCM to diagnose it? My mechanic originally ran the diagnostic and came up with a trouble code - it was # CO-550, which came up as something to do with the TCCM / ECU. Sort of vague though...

Just wondering if you were going off of a specific diagnostic trouble code, or off the hunch that it was your TCCM based on your research of the problem?

Thanks -

Dave

[TRAILBLAZER_GUY]

I know this Thread is over a month old, however i still think we need to follow up with the question asked previously, "Does another used 02 Trailblazer Module which is in current working condition a fix to install in an 02 Trailblazer with a bad TCCM?"


The Reason i ask is because i've heard that the 02 model TCCM is not Programmable... So does that mean that after the circuit is lost, it goes into sleep mode, Forever? Please share light on this since i find it difficult to understand that after a dead battery it would not work.

[ToddMeister]

I put a working TCCM from an 03 Trailblazer EXT into our 02 Trailblazer, works just fine, we did not reprogram the 03 unit. The old one out of the 02 was dead (no lights on 4WD switch/service 4wd light, dead TCCM code) I would think another working 02 TCCM would work in TB with a bad TCCM.

Originally Posted by TRAILBLAZER_GUY

I know this Thread is over a month old, however i still think we need to follow up with the question asked previously, "Does another used 02 Trailblazer Module which is in current working condition a fix to install in an 02 Trailblazer with a bad TCCM?"


The Reason i ask is because i've heard that the 02 model TCCM is not Programmable... So does that mean that after the circuit is lost, it goes into sleep mode, Forever? Please share light on this since i find it difficult to understand that after a dead battery it would not work.

[booka96]

was wondering if the 03 and 02 tccm are interchangeable on the trailblazer. is the tccm located in the same place on the 03 as the 02. my 02 is on the drivers side and looking at another website it shows a picture of it on the passenger side http://kylestubbins.com/node/11 , they look different in the pictures. any help is appreciated