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I've heard most of the time it's the wheel sensors or the module itself.
You can jack up the car, disconnect the sensor wire(coming from the magnet on the toothed wheel ring) and spin the tire.
The output from the wire should be about .5 to 1 volt AC!! (I think) but most importanly all should send the same voltage. (It's a magnetic pickup like in a lot of distributors- each tooth breaks the field and creates a small voltage spike). There usually an ajustable air gap also. Check for bad wires, grounds...the usual.
The module might have a series of trouble-code lights on the outside(probably not) that you can get info from the manufacturer. You can get Alldata or Mitchells on Demand for your car (~$25/yr) which may give info for special jumper procedures for trouble code retrieval. It could be a stuck valve as well....
Call your dealership for warentees and/or recalls...it's almost a new car and should be fixed for free. Good hunting.
Just infos sake- the regular brakes will keep working. The ABS pulsating fluid pressure relief fuction will not though.
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