The car will probably be repossessed.
It's almost unheard of for a car to be Repo'd because of one missed payment or bounced check, there has to be a history of non or late payment in order for them to take the car.
Immediately make the check good.
In effect, the car isn't paid off. If you check your documentation, you will find that they can do that. If the cheque bounced, the payments haven't been made.
The car dealer is not required to collect a down payment. The finance company is the one who usually asks for it. If they desire a down payment, they will contact you to get it.
Interest and down payment.
No.
If you refinance a car another down payment is usually not required. I refinanced a car to lower to payments and it added another year to the payoff date of the car. I wasn't required to give a down payment.
Car insurance companies do not require full payment upon acceptance. They do however ask for a down payment. If you go through a 3rd party you maybe able to get car insurance without a down payment.
Arguably the 2 most reputable insurance companies that offer automobile insurance with no down payment are "esurance" and "Car Insurance". Any other would typically involve at least a credit check.
YES, making the down payment is part of the contract and you are in default on it.
The dealership doesn't do anything. Its the bank you fiance the car through that takes action. Missing one is not anything serious but if you miss three or more in a row they will start calling you non stop and soon enough they will get somebody to repo it from your possession