What will happen if you gt into a car accident with no insurance in Colorado and were financing the car?

It can vary dependent on the extent of the damage. Either way, you'll be cited for both driving without insurance, driving an unregistered vehicle (your registration is null and void without insurance), and the accident (regardless of who is at fault, the perception being that the accident wouldn't have happened if your car wasn't there). The car will be impounded. If the impound fees are not paid, the government agency impounding the car will auction it off, and that takes priority over any other liens against the vehicle. If it's economically recoverable, the financier may go ahead, pay the impound fees, and repossess the vehicle. You'll be left with the balance of the loan to pay off, plus the repossession fees, plus the impound fees minus whatever they get for the vehicle at auction.