Question about 2002 GMC Envoy

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Service awd light on 2002 GMC Envoy

Light is stuck on 4WD can't, even when selecting 2WD or the others.

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Posted on Jan 02, 2017

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SOURCE: My 2002 Gmc Envoy is stuck in 4wheel low. I

Try disconnecting the battery for a few minutes, that might get you out of trouble for now. There are some common problems with these 4wd systems. Most common is the mode position sensor on the encoder motor. Sometimes it can be the switch on the dash. Fact of the matter is I can't tell you what is wrong without using a scantool to retrieve the fault codes from the computer controlling the 4wd.

Posted on Oct 16, 2009

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SOURCE: my 2000 gmc jimmy is stuck in either auto 4wd or

Use the Owner's Manual to manually go into neutral and reset to 2WD HI. But then look under the hood check the fuses or look for wiring that may have come unplugged.

Posted on Nov 19, 2009

johnjohn2
  • 5763 Answers

SOURCE: My 2002 GMC envoy 4wd switch lights do not light

no, you may have a bad switch or 4wd module,i ve done afew that had bad switches, but i would check it before just replacing it,

Posted on Dec 13, 2009

  • 1374 Answers

SOURCE: 2002 GMC envoy SLT 4x4, tccm, switch problem

About 45% of all transmission problems are due to a defective battery, its components and the charging system. Make sure you have the correct battery in the vehicle and inspect all items relating to the charging system and the battery. The vehicle should charge between 13,5 to 14.5 volts. The condition of the belts is part of this inspection. If all of this is A-ok then get a scanner and pull the codes in the PCM.
Remember once light is illuminated for a item that item no longer works. Once you've gotton to this point let me know and I'll walk you threw it. Hopefully its just a weak or incorrect battery or something along those lines. Good luck and keep me posted

Posted on Mar 09, 2010

Molson02536
  • 3854 Answers

SOURCE: I have a 2005 GMC Yukon XL. The service 4WD is on.

Yes you do have to take it to the dealer, This is a common problem in these trucks. This is caused by a bad encoder sensor in the shifter on the side of the transfer case. The sensor can be replaced with out having to replace the shifter assembly.

THe best test is to get the code from the system. This sensor is a sliding resistor and the material wears off causing a false reading. That is why the lights were showing Nothing, but you were able to drive. The code for the sensor is C0327.

TBS: #PIP3480M: Rattle Drone Or Buffeting Noise At Highway Speed In 2WD Or DTC C0327 - keywords 246 2hi 2high 4WD auto awd buffet buzz case click indicator knock lamp light service tick transfercase transfer vibrati - (Mar 4, 2008) Vehicles involved were built approximately between 01/01/04 and 03/06/06. The noise condition if not noticed by the customer may cause eventual encoder sensor wear causing DTC C0327 set in the Transfer Case Control Module (TCCM).

An updated TCCM calibration has been released to apply light pressure to the transfer case clutch pack and reduce the rattle. The calibration was released on 3/18/07 and the title line will read "to correct transfer case rattle at highway speeds and possible DTC C0327". For Rattle only (no current DTC C0327 set), Install the updated calibration and if necessary follow the diagnostics listed below

If the vehicle has a current or history dtc C0327 and can be diagnosed to the encoder sensor, re-flash with the updated calibrations and replace the encoder sensor as necessary.
Important Note: All NV246 transfer cases built 02/25/06 and beyond are manufactured with pressed fit parts to help reduce the rattle. Inspect the ID tag on the transfer case for this build date and verify the tccm has the latest calibration before repairs are initiated.

Thank you fur using Fixya and good luck.

Posted on Apr 20, 2010

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1 Answer

Envoy 2002 drive selector not working


The fact that it flashes 5 times means that it is trying to tell you what is wrong, you may have a faulty selector unit

Dec 14, 2013 | 2002 GMC Envoy

1 Answer

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.
Warranty Information

Jul 29, 2011 | 2002 GMC Envoy

1 Answer

I have a 2004 GMC Envoy XL and the high range 4x4 mode will not engage. The AWD system works just fine as well as the 4x4 mode in low gear. What is causing this?


Is the Service 4WD light coming on? Do the light on the 4x4 selector switch indicate the proper selection and are on steady after a few seconds? If there is no Service 4WD light on and the selector switch light are correct, the only place for the problem to be is the Transfer Case. Has the Transfer Case fluid been changed at 50K mile intervals? This is very important.

Feb 01, 2011 | 2004 GMC Envoy

1 Answer

My 2002 GMC envoy 4wd switch lights do not light up at all, not even on start. The fuses are all fine. Is there some other power source?


no, you may have a bad switch or 4wd module,i ve done afew that had bad switches, but i would check it before just replacing it,

Dec 13, 2009 | 2002 GMC Envoy

1 Answer

My 2002 Envoy will not shift into 4 wheel drive or anything other than 2WD. The lights are not lighting up on the switch and the fuses have been checked and good. Any ideas?


check the transfer case selector motor, they go bad and thats what happens, no 4wd and no other lights on switch because its not doing any changing of the tranfer case, to test remove motor ground it and with connector connected, try to switch to 4wd see if motor moves, you can use a test light to make sure its getting power, hope this helps.

Dec 13, 2009 | 2002 GMC Envoy

3 Answers

My 2002 Gmc Envoy is stuck in 4wheel low. I


Try disconnecting the battery for a few minutes, that might get you out of trouble for now. There are some common problems with these 4wd systems. Most common is the mode position sensor on the encoder motor. Sometimes it can be the switch on the dash. Fact of the matter is I can't tell you what is wrong without using a scantool to retrieve the fault codes from the computer controlling the 4wd.

Oct 16, 2009 | 2002 GMC Envoy

1 Answer

2002 envoy 4wd problem. clicking sound comes and


Clicking sound- Possible electronic fan clutch failing. This is a typical problem with the 4.2L I6. When you hear the clicking, open the hood and listen if its coming from the fan clutch on front of the engine. this could also cause abnormal engine and transmission cooling. As for the "N" light and 4wd issue, have scanned at the dealer....Hopefully this helps

Jul 18, 2009 | 2002 GMC Envoy

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