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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 03-07-2008, 01:37 PM
sinvids sinvids is offline
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Locating Transfer Case Module

Hi All,
I've had the diagnostics run on my '02 Envoy Slt and low and behold my transfer case module is faulty. My question is I purchased a new one on Ebay for $60.00 and was wondering where the transfer case module is located and can I change it myself? I know the reprogramming has to be done at the stealership but can I change the module before I get there or should I let them do the switch? Any help would be appreciated!
Natalka
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  #2  
Old 03-07-2008, 02:49 PM
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If you remove the cover on the left side of the instrument panel, you will see the module. You will need to remove the lower insulator panel to remove the module...you should be able to replace it yourself; it's fairly easy

However, I don't know what's going to happen when you try driving the vehicle before programming the module

Suggestion...make the appointment to program the module, bring the truck to the dealer, replace the module in their parking lot. When the tech comes out to get the car, let him know you just replaced the module and he can download the vehicle information in the parking lot. Once the info is in his Tech 2, he has to download the appropriate software from the computer terminal in the building, then upload it into your truck
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Old 03-07-2008, 03:48 PM
ScarabEpic22 ScarabEpic22 is offline
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Quote:
Originally Posted by PROSPHOTO View Post
If you remove the cover on the left side of the instrument panel, you will see the module. You will need to remove the lower insulator panel to remove the module...you should be able to replace it yourself; it's fairly easy

However, I don't know what's going to happen when you try driving the vehicle before programming the module

Suggestion...make the appointment to program the module, bring the truck to the dealer, replace the module in their parking lot. When the tech comes out to get the car, let him know you just replaced the module and he can download the vehicle information in the parking lot. Once the info is in his Tech 2, he has to download the appropriate software from the computer terminal in the building, then upload it into your truck
You are talking about the switch, I think sinvids needs to replace the TCCM encoder motor...

sinvids, is it just the switch or the the transfer case encoder motor?
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Old 03-07-2008, 03:58 PM
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Quote:
Originally Posted by ScarabEpic22 View Post
You are talking about the switch, I think sinvids needs to replace the TCCM encoder motor...

sinvids, is it just the switch or the the transfer case encoder motor?
The TCCM (transfer case control module) is under the dash...the module is mounted to the instrument panel "mag beam" () via a plastic mounting bracket. It has 3 electrical connectors in it.

The transfer case encoder motor (if interested) is bolted to the transfer case.

There are multiple components in the system; the main electrical components are the Transfer Case Shift Control Module (uses the Vin specific info for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine), the Transfer Case Motor / Encoder, and the Transfer Case Shift Control Switch.
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Old 03-07-2008, 04:16 PM
sinvids sinvids is offline
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I think you might be confused because I paid $60.00 (great deal on Ebay, here they cost $512.00 plus tax at the dealership!). My 4x4 isn't working and the dealer told me it was the TCCM that was the problem. I found almost everyone that has an Envoy or Trailblazer has this problem eventually.Either way, I will look under the dash right now to try to find the exact part as what I got today. Hopefully it works and the whole thing will cost me less than $200.00 to fix! (I live in Montreal where it's snowing like crazy this year!)
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Old 03-07-2008, 07:52 PM
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JMal JMal is offline
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Old 03-08-2008, 02:39 PM
sinvids sinvids is offline
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$512.00 Montreal, Canada dealership!
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Old 03-08-2008, 02:42 PM
sinvids sinvids is offline
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I couldn't seem to locate it. I unscrewed the two pieces beside and under the steering wheel, and did not find the part anywhere. Can anyone be more specific in it's placing? Thanks!
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Old 03-08-2008, 04:13 PM
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If you open up the left (drivers) side instrument panel cover (that you see with the door open), you can see the three connectors. This picture shows the module if you were looking at it from the cowl:

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Old 03-09-2008, 09:37 AM
Chacal Chacal is offline
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Sinvids:
Check for local scrapyards. In St-Hubert, there's a place called "Pat". You can get it for 175$ and 3 months warranty.
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