You can trade in a car if you are behind on payments, but the process might prove difficult. Most lenders require up-to-date accounts, meaning you'll have to pay the past-due amount. Late payments also affect your credit score, which ultimately affects your chances for a new loan and fair interest rate. How the Dealer Knows Let the dealership know that your vehicle is about to be repossessed. Even if you bring your vehicle's loan payoff amount or arrive after bank business hours, the dealership will obtain your loan payoff directly from...