Conditions for Setting the DTC
WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
C047A 00
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.
C047A 5A
The calculated difference between the internal steering angle and the external steering angle is out of the specified range.