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Q: Trac and VSC warning lights and loud beeping/alarm on 2001 Toyota Sequoia

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Driving on dry roads trac & vsc lights came on suddenly along with a loud beep/warning sound. Felt as if car was slipping/hydroplaning. Very scary. 3 weeks later happened again 3 times in one evening, again dry roads. This time heard a grinding noise possibly?
(1) Answer
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The Traction Control/vehicle stability control system has a fault which is stored in the memory of the computer in your car but requires a scan tool to retrieve. It is the same diagnostic connector used to retrieve "engine trouble codes" . Many sensors serve more than one purpose, and are shared between brakes, traction control, engine and transmission management. I'm not sure if the alarm is supposed to sound just to alert you the traction control system "is " working, on a S-Type Jaguar the Traction control light flashes rapidly when the system is working. Perhaps it's better explained in your owner's manual.Check here http://repairpal.com/automobile-owners-manuals-online or try this link you may be able to down load a free copy of the owner's manual for your vehicle http://www.autousermanual.com/