DTC Description
WARNING: This page is about a different car, the 2018 Hyundai Accent. However, it is still accessible from the selected car via links, so may be relevant.
B121600 is set when Rear Center Right Sensor* cannot transmit LIN data or transmits abnormal LIN data to BCM* because there is Faulty Power Supply, or Open/Poor Contact, or Short in LIN Circuit.