DTC B2401: Keyless/KOS key ID not register: Notes
WARNING: This page is about a different car, the 2013 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
- If the DTC B2401 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.