TCCM Replacement How To - Page 7 - 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 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #61  
Old 12-11-2009, 03:23 PM
Vonhendon Vonhendon is offline
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2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 4X4
Join Date: Apr 2008
Location: Columbia, MO.
Posts: 116
Thanks Roadie I was hoping to get your advice. Your knowledge on these board's is PRICELESS
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  #62  
Old 12-14-2009, 07:01 PM
eggman eggman is offline
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2002 Chevy TrailBlazer LS
Pewter 4.2L I6 4X4
Join Date: Dec 2009
Location: green bay, wi
Posts: 4
TCCM Replacement

Thanks to your insite, I was able to read this post and fix the infamous "service 4wd" dashboard issue.

Same symptoms on an '02 trailblazer. no lights on the switch, fuse pull didn't work.

I found a used tccm mod at a junkyard for an '03 for $50 and replaced it with your pictures and instructions in less that 15 minutes!

Now to tackle the front right hub, to correct the ABS service light.

Thanks all!
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  #63  
Old 12-28-2009, 04:21 PM
NigelTufnel NigelTufnel is offline
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2003 Chevy TrailBlazer LT
Black 4.2L I6 4X4
Join Date: Jun 2008
Location: Strongsville, Ohio
Posts: 4
access panel

I'm going through a TCCM swap on my '03 Trailblazer and after several attempts to unplug the TCCM connectors from underneath the dash, I noticed an access panel on the side of the dash. Open the panel and you have direct access to the TCCM connectors. Didn't see any mention of the access panel in previous posts so I thought I'd point it out.
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  #64  
Old 12-30-2009, 06:01 PM
wholeman11 wholeman11 is offline
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2002 Chevy TrailBlazer LS
Black 4.2L I6 4X4
Join Date: Jun 2009
Location: Buffalo, NY
Posts: 2
tccm?

hi everyone,
i'm having similar issues with my 02 trailblazer LS. Noticed that i had no indicator lights on my 4wd switch one day and after checking this site tried pulling fuse #8. after replacing, the service 4wd light came on and i now have a solid awd indicator light and a flashing 2hi indicator light. vehicle remains in 2hi no matter where there switch is. i don't hear anything when moving the switch from one position to the next and the indicator lights remain as noted. considering replacing tccm but can't find a used one and wanted to hear what others thought before buying new and having programmed. Any thoughts?
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  #65  
Old 12-30-2009, 06:16 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
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I would call junkyards, after seeing who had a trailblazer by looking on car-parts.com. Your 2002 is most likely a bad TCCM, but it would cost you more than the used one would cost to go to the dealer and have then run a communications diagnostic. You have no local buddies with a similar vehicle to trade with?
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  #66  
Old 01-05-2010, 01:01 AM
wholeman11 wholeman11 is offline
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2002 Chevy TrailBlazer LS
Black 4.2L I6 4X4
Join Date: Jun 2009
Location: Buffalo, NY
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checked that wedsite you recommended (thanks) and located a few yards in my area. Called a few of them and found a tccm from an 05 trailblazer. At first the guy i spoke to said he had a few of them in stock from 2002 - 2005 but he said i needed to check the id on the module itself to make sure one of these would match up. he proceded to give me several 4 digit numbers and told me to pull mine out and see if any of the numbers matched my current module. From what i've read, all of them are pretty much interchangable. Curious if anyone knows why he wants me to try to match the id # up.

And FYI for anyone who wants to know, $50 is what i'll be paying once i get this figured out
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  #67  
Old 01-05-2010, 01:50 PM
eggman eggman is offline
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2002 Chevy TrailBlazer LS
Pewter 4.2L I6 4X4
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Location: green bay, wi
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rpo lookup

I used this site http://www.gm-trucks.com/rpo-code-lookup/?find=gpu
I took a digital pic of the rpo sticker in the glove box and plugged in the 3 character abbreviations until I fould the one with my gearbox ratio. It started with the letter "G" I believe.

After that, I had the salvage yard confirm the rpo code on the vehicle they were taking the part out of to make sure the gear ratio was the same.
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  #68  
Old 01-06-2010, 10:09 PM
envoy02owner envoy02owner is offline
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2002 GMC Envoy SLT
Pewter 4.2L I6 4X4
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Location: St. Louis, MO
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Service 4wd Light

I have an 02 Envoy and was having the issues with the lights on the selector switch not lighting up so I replaced the TCCM with one from an 03 Envoy from a junkyard for $75. After replacing the TCCM the lights on the selector switch now light up and I can switch between all the 4 wheel modes after first starting the vehicle.

Something still seems to be acting flaky though because if I keep it in anything other then 2 wheel drive the Service 4WD light comes on after awhile and the selector switch seems to stop responding. The light of the mode that it was in at the time the Service 4WD light came on does stay illuminated. Only way to get the selector switch to respond again seems to be to turn the car off and back on again. Any ideas?
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  #69  
Old 01-06-2010, 10:46 PM
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the roadie the roadie is offline
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Either your front axle actuator or the encoder motor is slow to act, or dead. Search for other threads on the subject of identifying which one it is by sound.
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  #70  
Old 01-07-2010, 10:09 AM
envoy02owner envoy02owner is offline
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2002 GMC Envoy SLT
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Quote:
Originally Posted by the roadie View Post
Either your front axle actuator or the encoder motor is slow to act, or dead. Search for other threads on the subject of identifying which one it is by sound.
So I've been reading about listening to the noises made when switching the 4WD selector switch. The comments seem to say to do this with the engine off and the ignition in the on position. The only time the lights on my selector switch light up and the only time noises are made when moving the selector switch is when the engine is running. From what I have been reading this does not seem to be normal behavior, is it?

Also, did a little more testing and it seems that the only time the Service 4WD light comes on and the switch stops responding is when I am in the A4WD mode. 2WD, 4HI, and 4LO seem to work fine. In the past I have noticed when in A4WD that the wheels bite when turning so it acts like it is not disengaging when it should. Maybe that is why it is throwing the Service 4WD light on and making the switch stop responding?

Guess the cheapest solution is to not use A4WD which I have read is recommended anyway.
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