Black Book's extensive database enables us to calculate what your vehicle is worth based on its age, mileage, condition, options, and accident history—and also adjusts for the going price of, Car shoppers using J.D. Power trade-in values benefit from more precise value estimates and better deals when trading in cars. You receive a fair and accurate assessment when you request a value estimate for your vehicle from J.D. Power., Simply enter your VIN or license plate into the Carfax History-Based Value look-up tool to get the Carfax Value on your car, truck or SUV. Our unique VIN-specific value report considers reported accidents or damage, number of owners and the car's service history., , , .