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Hello, my name is***** this speed it was more than likely the collision avoidance system. Most of the time this is caused by a failure of one of the sensors, though it can be the module itself. This can be a scary situation. The dealer should be able to install their scan tool to see what occurred and to see what needs to be replaced. It will more than likely need to have the control module reprogrammed and a sensor replaced. It is a good thing this is under warranty as this system is hard and expensive to repair. If you need further help please let me know.