Sorry! And thank you for accepting my answer.
If you do not show up on the court date, the result will be that the plaintiff will be able to get a "default judgment" against you. Additionally, if you do not show up, you will not be able to assert any defense(s) to the complaint that you may have.
In a repossession case, the most effective defense would probably be that the car was resold (if it was), and you should therefore not be responsible for the entire amount that is claimed.
Another (less effective) defense would be that you were not properly served with the papers for the proceeding (summons and complaint).
Additionally, if you show up, you may be able to negotiate with the plaintiff or his attorney. The result of this negotiation could be a reduction in the amount you have to pay back, and the ability to pay it off over time.
But if you are not there, the plaintiff can pretty much get a judgment for the entire amount they are asking for.