Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal motor position sensor circuits, or a plausibility error as a result of a mismatch between the steering angle data from the internal steering angle sensor in the gear versus the external steering angle sensor data on the steering column.