Question about 2002 GMC Envoy

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When I switch my 2002 envoy into 4wd it does not engage and 4wd service light comes on? How can I fix this problem as it worked fine before

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  • GMC Master
  • 1,311 Answers

This problem could be the Transfer Case actuator/motor or the spline disconnect assembly at the front differential, or a bad Transfer Case Control Module. The other important maintenance action that needs to happen every 50K miles is the transfer case fluid needs to be changed.
Repair of these item is probably not for a unintiated DIY'r.

Posted on Jan 29, 2013

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Posted on Jan 02, 2017

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SOURCE: service 4wd light

what causes the 4wd to kick in when you have it in 2wd

Posted on Apr 05, 2009

GARYca
  • 672 Answers

SOURCE: 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

Posted on Jul 18, 2009

  • 285 Answers

SOURCE: service 4wd light is coming on but 4wd works fine

i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

Posted on Sep 05, 2009

  • 118 Answers

SOURCE: service 4wd light

That's for the dash switch for 4x4- need to properly diagnose also you could have bad wires, most likely water intrusion for 4x4 module rt frt passenger kick panel inspect for white corrosion on terminals & connectors, clean with terminal cleaner from radio shack

Posted on Sep 07, 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

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1 Answer

What does it mean when the service 4wd light comes on in my 2002 gmc envoy?


It means the transfer case control module has detected an error in the system...it could be the encoder motor, transfer case, dash switch assembly, axle engagement assembly or even the transfer case control module (TCCM) itself..you will have to take it in and have the the TCCM read for codes

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Most likely cause is the encoder motor on the transfer case. This is the motor that activates the transfer case. Usually sets a code so you may want to have it scanned.

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When the 4WD Service light comes on it means that the Transfer Case Control Module (TCCM) has not received the proper feedback from the two actuators that control the 4WD engagement. The system needs to be diagnosed by a technician.

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To start with, a basic engine computer code reader will not connect to the body computer which is why they are not getting any codes.
The 4wd lights will not come on as long as the warning light is on, the system is disabled until it is fixed.
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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.

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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

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

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