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.
C1671-81 sets when an abnormal value has been received from the BSD (= Blind Spot Detection) Yaw Rate Sensor. BSD (= Blind Spot Detection). It turns OFF the BSD (Blind Spot Detection) switch LED and inhibits the system.