In general, car dealers cannot repossess a vehicle without giving you notice and an opportunity to cure the default.
Some states have specific laws that dictate how long a car dealer must wait before repossessing a vehicle.
In Massachusetts, for example, a car dealer must wait at least 20 days after sending you a notice of delinquency before repossessing your vehicle.
If you are concerned that your car may be repossessed, you should contact the car dealer and discuss your options.