Question about 2002 Chevrolet TrailBlazer

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Where is the tccm located on a 2005 suburban?

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The TCCM is on the driver side behind the dash...right behind the the light swith. The easiest access is to take the dash off that covers the light switch and extends over to the radio area. Also the lower coverings will need to be removed as well. Once those are off, the TCCM can be accessed. It has three connectors (two large blue and one small black). disconnect the connectors and remove the unit. Note: once you have disconnected the connectors you will notice one of the large connectors is grey(middle connector), make sure it goes back into the proper place when reinstalling. If you are replacing the TCCM with a new one, you will have to get it reprogramed.

Posted on Aug 25, 2010

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The TCCM is located behind the instrument cluster you will need to remove it to gain access to the module.

Posted on Aug 25, 2010


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2-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)
999999995.gif Subject: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module) Models: 2004 Buick Rainier 2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2002-2004 GMC Envoy, Envoy XL 2003-2004 GMC Sierra, Yukon, Yukon XL 2004 GMC Envoy XUV 2002-2004 Oldsmobile Bravada with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)

This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
ConditionSome customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
CauseThe Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
  1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5.
  2. Remove the underhood (ATCM or TREC) TCCM fuse.
  3. Wait 30 seconds.
  4. Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
  5. Check for codes in the TCCM. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6.
  6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
  7. Verify operation and that no codes are present.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
Warranty Information

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My 2005 durango engages the 4 wheel drive by itself and wont disengage the service 4wd light comes on first what could the problem be please help

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Other times, the TCCM or Transfer Case Control Module was at fault and needed to be replaced.

If you are fortunate enough to be still under the 7/70 powertrain warranty, the dealer will replace the TCCM for the $100 deductible.

Otherwise, it can cost in the region of $400.


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