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Q: All Wheel Drive on 2003 Buick Rendezvous

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All Wheel Drive light came on. Cable was switched and the light went off. Driving to Hilton Head, SC the light came on again. What could be the problem?
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the light comes on for a reason. turning it off never fixes it. it could be the tires are worn more either in the front or rear. or you may have a abs issue that disables the all heel drive. the tires are the more common issue. you must replace all 4 for the wheel speeds to be identical.

Same thing happened to mine. The AWD DISABLE light came on at Thanksgiving, stayed on....checked tire pressure and treadwear; they were fine. Finally took the car to dealer for diagnosis. It turned out to be a valve on the transfer case, the Rear Diiferential Clutch Pump Valve.
You need a new flow valve. To change one, you need to locate the old one, which is located in front/bottom of the rear differential. Put a drain pan under the rear differential, disconnect the electrical connector and remove two screws and slide out. The fluid will come out and drain into the pan. Reinstall with a new flow valve. You have to add new versatrak fluid to the differential in the fill plug until it flows out. The flow valve was $400 and the versatrak fluid was $100 at the dealership for four pints. It fixed the AWD disable problem
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