The engine C1406 Code is a necessary thing and it gives the information of the car engine problem. Do not follow the automobile meaning of the code what you will get from online. The general 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. 0 for IC Circuit High Voltage and 6 for Cruise Control System – Vehicle Accel Too High. Chassis problem of the car engine can be solved easily at the cheap rate. Do not drive the car with the engine problem.