DTC Description
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
C1667-00 is set when C-CAN Communication is normal, but CGW* cannot receive C-CAN message from SCC* for 10sec because there is Faulty Power Supply to SCC*, or Open/Poor Connection in High line/Low line of SCC* Branch Circuit of C-CAN network.
If the DTC still appears even if the problem is corrected and the system operates normally, perform "Vehicle S/W Management " → "Erase Network Configuration", and erase the DTC.