The general meaning of the engine C1457 Code is an important thing and getting the real meaning of the code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 4 for Transmission. 5 for TP Sensor Learn Not Complete and 7 for Cruise Inhibit Control Circuit. However, do not follow the general meaning of the code. If you follow the dictionary meaning, it may create more problem from the car engine. The chassis problem of the engine is not serious problem but you should solve the car engine problem if it is minor or major.