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Basically, the system senses that engine drag (foot off the gas or nearly so) would be enough to make the rear wheels slide. A kind of backwards traction control. Usually seen when you let off the gas quickly at high rpm, especially on slippery pavement.
Well, I guess this means a trip to the dealer. It did it again today when I let off the gas after going 24mph. I guess I may as well have them do the top recall as well.........