I have noticed this as well, seemingly in colder (not freezing, just cooler) weather that the solid VDC light comes on at random and stays on. It is not a result of any traction issues, it just turns on and remains on until the car is shut off and restarted. Been meaning to RTFM and see if there is any info.
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2011 Touring/Sport/6mt | winter: 2009 WRX
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