Try replacing the evaporator vent valve. It closes in order to seal the vent so the system can pressurize and ensure there are no leaks.
Trouble code P0446 means: EVAP Vent System Performance
Trouble code P0174 means:System too lean (Bank 2)
Trouble code P0171 means:System too lean (Bank 1)
Its a misfire detected on cylinder No. 2
Trouble code P0505 means: Idle Air Control System
Trouble code P0432 means:Main catalyst efficiency below threshold
What is Rayond James & Associates DTC number?
If you get DTC code P0171 or P0172 then It could be Mass Air Flow sensor gone BAD. Clean it or repalce it.
Trouble code P0755 means: A/T 2-4 Solenoid Circuit Malfunction
Diagnostic Trouble Code
0221
If the Pcm sets a code saying that it's companion has dtc, you need to check the Ecm because it will have a code in it.If the Pcm sets a code saying that it's companion has dtc, you need to check the Ecm because it will have a code in it.