DTC B2423: 6 CD Player Error: Notes
WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
CAUTION:
Before replacing the radio and CD player <CD changer built-in type>, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.