DTCs are codes that are stored by the car’s in-board computer system in response to a vehicle issue. Codes relate to a particular problem and are made up of a 5 digit alphanumeric sequence and are used as a guide to help locate the fault in order for you to fix the vehicle. Shopping Cart Categories Livechat Best Seller You have 0($0) item in your Shopping Cart cart is empty. Qty: D900 CANSCAN OBD2 Code Reader Scanner | Auto code reader Hello Guest, Login | Register 1