Question about 2001 Chevrolet Suburban

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Service 4 wheel drive dash light keeps periodically coming on what should that be

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Could be a bad sensor or selenoid for the 4 wheel drive unit. The gears lock in electrically with a selenoid and this may be what is causing the warning lite. There are so many sensors on cars nowdays the only true way to figure this out is to take it to a dealer and let them hook it up to their computers and download any warnings from there. they should be able to tell you excatlly what is causing the warning light. Hopefully it is just the sensor.

Posted on Nov 14, 2010

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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!!

Feb 21, 2009 | 2004 Chevrolet Suburban

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