The engine C1513 Code is necessary thing and it is important thing for solving the car engine problem. You need to know the real meaning and it is provided by the car manufacturer. Your car manufacturer has set a meaning of the code and you need to follow that meaning for solving the engine problem. Do not follow this automobile dictionary meaning of the code and it is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 1 for Low Coolant Circuit and 3 for Transmission Control Module Reprogrammable Memory.