It means that your CD player is not reading the CD , try a different CD and preferably original CD and see if it reads it then. If the CD player works ok then, you had bad CD and if it should read error again then the CD player it self is defective.
this obd2 trouble code table can help you understand the meaning of code.
for p0446, you can try:
Replace Vent valve
Repair open, short, or resistance problem in control circuit
Repair open, or short, or resistance problem in power circuit
Replace PCM
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