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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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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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!!

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Try to rock it by putting it into D an R it works for my truck.

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Four wheel drive in cold


It is due to the cold weather,The fluid is to thick when cold for the actuator to engage the 4wd.

Please rate this solution.

Jan 16, 2009 | 2007 Chevrolet Colorado (Extended Cab) New...

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Stuck in two wheel drive. I changed my front wheel bearing the four wheel drive went out. The four wheel drive lights on dash blink then go out. Service 4 wheel drive comes on. Is there a servo that...


There is an electric motor that engages drive.  Mine was stuck and a mechanic beat it w a hammer while I was in vehicle w brake on in drive pushing the diff 4wd buttons.  It freed up and started working fine!!  It looks like a small starter under car on passenger side. Or buy one on ebay  for cheap and replace it

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