Tccm ?? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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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 11-09-2012, 09:19 AM
02ENVOYhell 02ENVOYhell is offline
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2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 4X4
Join Date: Nov 2012
Location: Brantford Ontario Canada
Posts: 3
Tccm ??

Hi. So about a month ago on a rainy day I engaged my a4wd. I parked the truck and did some shopping. When I started the truck again I noticed the indicator light on my 4by4 selector switch was not lit up.

I contacted my regular mechanic and he had no clue. Suggested I take my truck to a transmission repair shop. I have spoken to several including the dealership and have received a variety of answers. One said he'll need to tear my tranny down and take a look inside.

This truck has had a tranny rebuild and transfer case replaced 1.5 yrs ago.

In researching on my own, it looks as though its my tccm but I don't have any warning lights on my dash.

Could be as simple as replacing the switch?

Any suggestions here? I'd really appreciate any help or advice you have to offer.
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  #2  
Old 11-09-2012, 09:21 AM
02ENVOYhell 02ENVOYhell is offline
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2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 4X4
Join Date: Nov 2012
Location: Brantford Ontario Canada
Posts: 3
I should have mentioned that I can't switch out of 2hi
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  #3  
Old 11-29-2012, 08:24 AM
toyz4roy toyz4roy is offline
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2002 GMC Envoy SLT
Monterey Maroon Metallic 4.2L I6 4X4
Join Date: Jun 2008
Location: Bowmanville, Ontario
Posts: 3
Fellow Cdn

I'm looking into this right now, I have the same issue. I have heard that Dorman part 599-113 is a replacement part that doesn't need programming. I'm heading to the mechanic to get the codes read and then will look into Cdn pricing on this. I think I would rather buy the dorman than risking getting one out of a scrapper.
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  #4  
Old 11-29-2012, 07:50 PM
freddyboy61 freddyboy61 is offline
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2004 GMC Envoy SLE XL
Summit White 4.2L I6 4X4
Join Date: Jul 2008
Location: Long Island, NY
Posts: 1,240
The TCCMs in the 2002 trucks are notorious for going stupid. Your problem could also be a bad selector switch. With the truck off, try working the switch thru all of its positions many times (50 or more), this may help clean off the contacts. The switch is not an expensive item, you may want to replace it before replacing the TCCM.
A shop with a high end scan tool can determine if the TCCM is bad.
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  #5  
Old 12-01-2012, 06:09 PM
toyz4roy toyz4roy is offline
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2002 GMC Envoy SLT
Monterey Maroon Metallic 4.2L I6 4X4
Join Date: Jun 2008
Location: Bowmanville, Ontario
Posts: 3
I took the Envoy to a mechanic friend with a scanner. The code that came up was the CO550. I ordered a replacement Dorman remanufactured TCCM item # 599-113 from the local NAPA retailer for the price of $200. I was able to install it this morning in about 20 minutes and the 4wd is working again. When the Envoy was on the reader you could see the voltages being sent from the switch to the TCCM so I was pretty confident it was the module and not the switch that was bad.
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