The car engine should be fixed properly and you may need to take help from an expert automobile engineer. The car engine P1446 Code lets you know about the problem and location of the problem started. Here, the main problem is powertrain what is not difficult to fix. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 4 for Transmission. 4 for BBV Sensor Circuit Low Voltage. 6 for Cruise Control System – Vehicle Accel Too High. When the car engine is fixed, take it for a test drive.