2007 tahoe 4wd module

[masterofyard]

I just pulled my tahoe from the dealer when they told me that they want $800 to replace my 4wd module. Can some one tell me where it is located and where I can bye one. Any help is greatly appreciated.

 

[clkelley]

Welcome to the neighborhood!

First we would need to know which module they are talking about. Were they talking about the switch on the dash or the TCCM (Transfer Case Control Module). I can get some OEM parts and can help you find what you need even if you don't get it from me.

 

[masterofyard]

problem I have is the code that came up was a uu0102 which is no communication for the data link. The message center on the dash says service 4wd and the dealer just told me the 4wd module needs to be replaced. I think the body module to the left of the cluster controls the 4wd, but I also know the shift control on the transfer case does too. The dealer wont tell me which one the came up with to replace.

 

[clkelley]

IF the dealership won't tell you what part they are wanting to replace or anything like that, I would recommend getting the contact info for the GM rep for your region and get tehm involved. The Dealership should tell you everything involved.

If you are mechanically inclined at all I would go through all the harness plugs. Making sure they are clean, dry and add a little dielectric grease to them to ensure the failure in communication isn't caused somewhere in a plug which is often the case.

The main issue that makes it so hard to diagnose is that a failure to communicate is usually NOT coming from the bad module. It is being reported by a module or sensor that is not receiving a signal from another module or sensor. A common problem is the mode sensor in the transfer case. If the control module can't tell what mode the transfer case is in to start with then the other modules in the system will not know what to do to complete the task you have commanded.

I would personally start by eliminating wiring harness and plug issues first. Then, my FIRST choice in replacing parts would be the mode sensor in the transfer case. The problem is, because of the way the code is reported through the system, it is often extremely hard to tell which actual module is faulty.

 

[masterofyard]

Thanks for the response. I finally got an answer from the dealer. They told me the module under the dash needs to be replaced. Only thing is that they seemed pretty vague and not to the point when i was questioning them. I did check all the connections. I couldnt get them to answer if the body module to the left of the cluster is the sane module that needs to be replaced. My question is if this is the only module that also helps control the 4wd. I am hoping that someone might know.

 

[clkelley]

There are actually several modules that work together in the 4X4 system. The switch that has the buttons, one on the side of the transfer case, one inside the transfer case and one at the front differential. That is why it is so hard to pinpoint which one is actually causing the problems. IMHO, the dealer is wrong if you can attempt to use the switch on the dash and hear something trying to happen under the truck, if not then they may be correct. However, while those switches do go bad, the most common issue I have seen is with the 4x4 position sensor inside the transfer case, like I stated above, if this sensor is bad then the rest of the system cannot tell what to do when you hit the buttons on the dash because the system cannot tell what mode the transfer case is in.

 

[masterofyard]

The switch on the dash has no lights and and does nothing. I am told the switch doesn't have any indicator lights and does not work because of the trouble code that is being produced. This is why I am questioning if the body control module also works in part with the 4wd.

 

[masterofyard]

U/D... I spoke with gm corporate. They told me to replace the module which is on the left of the cluster. I ordered it from gm and will have it tomorrow. Does anyone know if ot needs to be programmed before I install it? Gm wasnt sure, and the dealer wouldnt give me an answer.

 

[clkelley]

It shouldn't need to be programmed. It kind of surprises me, and then kind of doesn't surprise me that GM corporate didn't have an answer on that. Also, my buddy, the Master Tech is the kind of guy that can quote part #'s from memory during diagnostics, he is absolutely unbelievable in that regard, but he told me that on the trucks he has seen those issues on that the switch on the dash is usually the default part to replace first, although usually not the culprit. That being said, I truly hope that fixes it for you, but I would recommend something else, if there is another dealership within driving distance to you I would definitely find it and go there next time to see if they are different. All dealers are different in that while one dealer won't tell you anything, another may help you figure it out and help you get it done without any trouble just to have the future business.

LEt us know if replacing the switch fixes the issue!

 

[masterofyard]

I installed the module. The check engine light and the service 4wd is now off. The indicator lights on the 4wd knob arent lit. I am thinking that it might have to be programmed. I am taking the truck in for an inspection and will update to let you know what the shop says about programming the module.

 

[Tecoct]

I am having same issue with my Tahoe. I replaced the TCCm and the 4wd indicator light won't work. Did u ever get it to work?

 

[rockenthebowtie]

Yes the module needs to be programed with software just like any other computer hardware it needs to have software downloaded

 

[Tecoct]

K thanx

 

[rockenthebowtie]

De nada

 

[brgunder1]

I am having a similar problem with my 2007 Tahoe, problem is I live overseas and there aren't any Chevy mechanics, so it's all on me to fix!

Where exactly is the transfer case control module located? Is the TCCm the same thing as the actual switch in on the interior console?

Lastly does a replacement TCCm need to be programmed as an earlier poster mentioned?

Thank you!

 

[masterofyard]

Yes it needs to be programmed and is located on left side of dash by the obdII link

 

[brgunder1]

Any idea how to program it? Can any mechanic do it or does it have to be one from a chevy mechanic?

 

[masterofyard]

Snapon scan tool can do it if you have the correct module… if not.. A dealer

 

[brgunder1]

I spoke to the Chevey dealership where I bought the car, they are telling me that only a chevy dealer can program the TCCM. I am located outside the US and there aren't any chevy dealers here. Is this accurate or can it be programmed with the right scanner tool?

 

[Ladybitz]

Yes it needs to be programmed and is located on left side of dash by the obdII link

Was it the transfer case control module or the body control module that you replaced?