Question about 2002 GMC Envoy

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2002 envoy 4wd problem. clicking sound comes and

2002 envoy 4wd problem. clicking sound comes and goes - seems like its coming from the front. Can't shift out of 2wd. The "N" indicator light next the the 4wd switch lit up today for the first time since I bought it new.

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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

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Posted on Jan 02, 2017

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Chevy 2002 2500 series, 4x4 will not engage, when shifted into 4wd a kind of grinding noise comes from the front like gears are not meshing.


No hubs on 2002 Chevy 2500. I'd check the front axle actuator (engages front axle when 4WD is engaged). Belive it's on the passage side axle tube of front differential. Could be wrong, but that's what it sounds like. Or the front ring/pinion is shot. They don't turn when not in 4wd.

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I have a 97 chevy s10 4x2. I also have a winding sound coming from the same area. I believe it could be one of two things or both, water pump, power steering pump. keep in mind depending on the size motor you have, the 4.3l vortec wich is what I have and the v8 has a natural winding sound to them in that area. you will know a difference when that winding sound becomes more of a needed replacement part. good luck

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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


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.

Jan 21, 2013 | 2002 GMC Envoy

1 Answer

The service 4wd light came on in my 2002 envoy.


There are two motors under the vehicle. The front axle actuator moves ONLY during 2HI->A4WD and A4WD->2HI transitions. The transfer case encoder motor makes a lower pitched noise in every mode transition: 2HI->A4WD, A4WD->4HI, and 4HI->4LO, and the three transitions upwards.

If EITHER of the motors fails to do what the TCCM commands it to do, the switch light will flash and the Service 4WD light on the dash will come on.

If you're a DIY mechanic, you might look into them further, or just take it to a mechanic who knows our systems. The average mechanic is not going to know the theory of operation of the trailblazer/envoy 4x4 system, which is pretty unique in the industry

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2002 Envoy AC only works on auto and for a short time


replace control head if the ac works on auto

Jul 03, 2009 | 2002 GMC Envoy

4 Answers

2002 gmc envoy front suspension noise


the clunking or rattle sound is actually coming from the end links on the anti sway bar. You won't hear it on the bumper test. Good luck.

Nov 15, 2008 | 2002 GMC Envoy

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