The definition of the C1213 Code is available as general meaning and the automobile dictionary meaning of the code is C is Chassis Code Problem is controller area network wiring bus and modules. 1 is MFG – Manufacturer Specific. 2 is Accelerator Pedal Position (APP) Sensor one Performance. 1 is Low Coolant Circuit and 3 for Transmission Control Module Reprogrammable Memory. C1213 engine code seems a kind of chassis problem. Problem of the Chassis is not very difficult to solve. You need to have experience if you want to solve the car engine problem. Make sure the problem is solved by a test drive.