Question about 2004 Buick Rainier

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What is wrong w/04 buick raininer awd dont work, service light does not come on ?

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  • BRYON CLEMONS Feb 23, 2012

    I have tested the awd in the sand, it has a rear locking diff. all it does is spin the rear wheels untill the rear end is deep in the sand whith to rear spins. no power to the front at all, I put a snap on scan tool on it and it shows the front and rear speed sensors are working. the trouble light does not come on and there is no stored codes.

  • Reynaldo Andico
    Reynaldo Andico Feb 23, 2012

    You have a wire harness problem,inspect wire harness to transfer case speed sensor,you speed signal may be interrupted,especially at the rear, There is a TSB so look this up this is your concern and here is the solution TSB bulletin 05-04-003c

  • Bryon Clemons Dec 23, 2013

    getting full reading from front and rear sensors, harness and connectors are like new, next must be encoder motor awd service light comes on when rear spins

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  • Buick Master
  • 2,431 Answers

There are 2 types of AWD full time and part time.In AWD there is difference in speed from front to rear These system are not selectable and do not have low range. There is also on demand AWD.This is a 30% to front and 70% to rear. To truly diagnosis your concern is with a comparision vehicle.

Posted on Feb 23, 2012

Testimonial: "the front and rear speed sensors read ok while driving, it was tested with a scan tool"

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Click the link below:---2004 Dodge Ram: High Beam Light is DIM? http://technoanswers.blogspot.in/2012/04/2004-dodge-ram-high-beam-light-is-dim.html
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2002 envoy code co550


you need to replace the tccm and get it programmed.


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®.
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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