Gap insurance typically requires that you have full coverage insurance (comprehensive and collision) in order to be valid. This is because gap insurance is designed to cover the difference between what you owe on your car loan and the actual cash value of your car if it is totaled in an accident. Without full coverage, which covers damage to your vehicle, gap insurance would have no basis for calculating the difference between the loan balance and the vehicle’s value. Essentially, gap insurance fills in the financial gap left by your primary insurance, so having full coverage is a prerequisite for it to function properly.