Possible Cause

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

Back up circuit (between steering angle sub control module and steering angle main control module) is open or short.
Back up circuit (between steering angle sub control module and steering force control module) is open or short.
Motor circuit (between steering angle sub control module and steering angle sub motor) is open or short.
Motor angle sensor circuit (between steering angle sub control module and sub motor angle sensor) is open or short.
Steering angle sub control module