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Old December 28th, 2009, 09:05 PM   #1
badazzamc
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Default 02 Trailblazer 4wd not working

My dad has an 02 trail blazer, the service 4wd light is on and the lights around the 4wd come on at start up then they all go out and stay out. If you move the switch you get no lights still and the truck does not go into 4wd. The switch was just replaced thinking that may have been the problem. Any ideas where to start? I am thinking its computer related and may need to be flashed, just hate to take it to the dealer if thats not the case. Any help would be great
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Old December 29th, 2009, 12:51 PM   #2
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Check the fuse first, then transfer case motor. You already replaced the switch, these three are the most common problems! Next summer make sure to engage 4x4 once or twice a month to keep the motor from freezing up.
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Old December 29th, 2009, 12:55 PM   #3
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GM Tsb
#02-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)

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).
Condition

Some 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.
Cause

The 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.
Correction

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.
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Old December 29th, 2009, 06:34 PM   #4
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Thanks IFS thats what I was looking for.
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Old December 30th, 2009, 07:25 AM   #5
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Quote:
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Thanks IFS thats what I was looking for.
Np
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Old December 12th, 2011, 10:01 AM   #6
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I had the same problem on my 2002 Tralblazer, no 4WD and no lights on the switch. I removed the fuse for 30 seconds and it still would not engage 4WD. I installed a used TCCM Module and now I get a Service 4WD light and the lights on the switch come on but it will not shift into any 4WD position. What would be the logical next step?
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Old December 13th, 2011, 10:30 AM   #7
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I had the same problem on my 2002 Tralblazer, no 4WD and no lights on the switch. I removed the fuse for 30 seconds and it still would not engage 4WD. I installed a used TCCM Module and now I get a Service 4WD light and the lights on the switch come on but it will not shift into any 4WD position. What would be the logical next step?
6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
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Old January 25th, 2012, 07:55 PM   #8
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I'm sharing a similar problem with my 02 trailblazer. Except mine will go into 4Lo but not A4wd or 4Hi. Could that still be a tccm problem. I'm guessing the shift motor has to be good?
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