Although OnStar has offered Stolen Vehicle Location Assistance to its subscribers since 1996, the firm is getting set to add a snazzy new enhancement for 2009 vehicles. The feature, dubbed Stolen Vehicle Slowdown, can use GPS to pinpoint a vehicle once it has been reported as stolen, and after OnStar confirms with local police that it has the vehicle within sight, it can then be slowed down remotely. The system actually receives a signal that “interacts with the powertrain to reduce engine pow…

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