The car was being operated by my daughter Nicole on the highway when the car in front of her stops suddenly. The collision avoidance system did not engage there was no warning and the brakes did not automatically engage. It resulted in a minor rear end collision without airbags. The dealer has already checked the system and says there are no faults. I have other Chrysler vehicles and I have seen the system activate on all of them at one point or another. Never before has one not activated in a situation where it should have.