Question about 2002 GMC Envoy

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Four wheel drive only works in summer

Service four wheele drive light comes on when it's cold out. Works and engages four wheele drive fine when it's warm out, above 55 degrees.

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  • 61 Answers

Sounds the wheel senser reading something not working properly

Posted on Dec 19, 2008

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Posted on Jan 02, 2017

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there maybe some dirst in the sensor - try cleaning it

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Four wheel drive service light


Same as all vehicle issues in the past 30 years

Check for codes & google them to see the issue

You have a dash light on --SO --DO SOMETHING

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My 1988 K1500 four wheel drive has grinding sound, 2wd works just fine, only when I engage the four wheel drive does it make grinding sounds, and the left front turns roughly and irregulary. I think I...


im having the same problem... 2wd works fine, 4wd lo and hi both when the engine is just above idle and the wheels spin there is a knocking and when it goes too fast its like a grinding.... ive been told it was the actuator... but ive yet to test that theory... let me know what u find out on that... id sure like to get mine fixed too

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Wont go into four wheel drive lights dont come on


mounted to the tranfer case you will see what looks like a window motor. Round with wires coming out. This is the actuator motor for the four wheel drive. A lot of times if they are not used the brushes will stick in the motor and if they do the four wheel drive will not engage. Sometime you can tap on the motor and it will work. You also will have a fuse for the four wheel drive in your fuse panel. Good luck, hope this helped

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2000 blazer 4 wheel drive problem


It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.

Jan 05, 2010 | 2000 Chevrolet Blazer

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The 4 wheel drive with a turn knob control will


take the four wheel drive actuator out of the front differential let it hang while still plugged in and have somebody watch and see if it retracts when the 4 whell drive is switched from 2 to 4 whell drive. If not then accuator is probably bad.

Jan 05, 2010 | 2007 Chevrolet Silverado 2500HD

1 Answer

Four wheel will not engage


you need to also check the relays that are in same circuit

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1998 isuzu trooper torque on demand lights go off when truck stops moving


It is Torque On Demand. When you are stopped there is no need for the front end to be engaged, no demand. Once you start moving, the lights should begin working as the demand for four wheel drive engagement increases, if the conditions require four wheel drive. It's the way the system works. Enjoy!

Aug 10, 2009 | 1998 Isuzu Trooper

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90 GMC 5.7liter motor.Transmission will sometimes when put in drive not engage.If I wait a few minutes,it will engage and works fine after that.Mostly does this when outside temps are cold (28 to 40...


The filter might be clogged/old and the cold makes the fluid heavy. With the 700r4 transmission its always best to let it warm up for a few minutes.

Feb 24, 2009 | 1992 GMC Sierra K1500

2 Answers

Four wheel drive wont engage


If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion. You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.

The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 21, 2009 | 2004 Chevrolet Suburban

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