910 days (about two and a half years) is an important threshold in the life of a car loan for a prospective filer of chapter 13 bankruptcy.
Like other secured loans, a car loan can become underwater or undersecured, where the value of the car is less than the amount owed on the loan. This most often happens when cars are purchased new and depreciate faster than the loan balance is repaid. It also occurs when loans have high interest rates or when the car loses value unusually fast, as is the case of high mileage or an unpopular make and model.