New 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 General Tech Q&A > General

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  #1  
Old 10-30-2009, 10:31 AM
Elsa19 Elsa19 is offline
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2002 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Oct 2009
Location: Ontario, Canada
Posts: 3
Question New TCCM

Hi, new to the site and have a different kind of question regarding the TCCM. I had mine reflashed and it worked for a whole day. So, the dealer is telling me to replace it will be over $1000. He said that with replacing the TCCM with a new one($600) requires it to be programmed($95). My questions are: Does a new one really need to be programmed? Or could I take it to my long-time and trusted mechanic to swap it out for a used one (ebay $200) and not worrry about the programming? I just don't want to be the dumb chick who walks into a garage and not know what the hell I am talking about and pay through the nose for it. Any advice will be great!! Thanks in advance.
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  #2  
Old 10-30-2009, 11:16 AM
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Chickenhawk Chickenhawk is offline
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2004 Chevy TrailBlazer LT
Medium Red Metallic 4.2L I6 4X4
Join Date: Apr 2008
Location: Canada
Posts: 996
New ones need to be programmed because it needs to know the correct tire sizes and axle ratios on the vehicle.

Used ones may also need reprogramming, unless you happen to get one off a vehicle that coincidentally has the same tire size and axle ratio as your vehicle. (There is actually a pretty good chance of this.)

Why not get your trusted mechanic to put on a used one and then take it to the dealer for reprogramming?

Also, before you do this, make sure your trusted mechanic has carefully inspected ALL the wires going in to the TCCM. It was a common problem on the S-series Blazers because their TTCMs were in the passenger side kickpanel and more exposed to corrosion, but some TCCMs just have bad or corroded connections at the module.
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  #3  
Old 10-30-2009, 12:57 PM
Elsa19 Elsa19 is offline
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2002 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Oct 2009
Location: Ontario, Canada
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Thanks for the info! I guess I will have to get it programmed as I have upgraded the crappy BFG Longtrail OEM tires, not by much... just to a Falken Ziex 265/70/R17(LOVE THEM!). I plan on getting the work done then at my mechanic; they didn't charge me anything to even look at the TCCM since they couldn't fix the problem. Then I'll take it to the dealer to have it programmed.
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  #4  
Old 10-30-2009, 01:12 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
That kind of change won't need reprogramming. Save your money.

Make sure you buy a 2003+ used TCCM, to make sure you don't get another first generation doggy one.

The issue has to do with the algorithms used for the A4WD function, and I strongly recommend not using that mode on snow and ice. If it's slippery enough to need 4WD, just go into 4HI. Our A4WD mode needs to detect wheel slippage BEFORE it engages, and it tends to engage with a bang.

That can break tires loose, but MUCH WORSE, it can break an internal bearing mount inside the transfer case that was found to be weakly designed. Since your 2002 transfer case has this weak bearing mount, you want to avoid stressing it out with sharp shocks of A4WD activation.

$600 Canadian for a new TCCM? What are they smoking?
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  #5  
Old 10-30-2009, 01:35 PM
Elsa19 Elsa19 is offline
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2002 Chevy TrailBlazer LT
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Apparantly, they smoke legalized pot I was floored after seeing what they cost online!! Fortunately, I commute to Buffalo for work and I can get parts for much cheaper; not to mention I befriended a mechanic near where I work and he has gone on a hunt for me to find a used part. Also, since I commute to the 'snow-belt' my 4X4 is extremely important to me and the safety of my 3year old son!!
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  #6  
Old 11-02-2009, 04:54 PM
gregl01 gregl01 is offline
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2002 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 4X4
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Location: Frewsburg NY
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I just pulled a used one from a 2004tb and it works great!!!! Not a bad deal for $20 !!!! Don't believe them when they tell you it must be programmed blah blah. That means they want to charge you more labor. Pop in a used one and go!!!!

Greg
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