Diagnostics Aids
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.
A communication error between the Electronic Brake Control Module and Power Steering Control Module can cause DTC C047A to set in history and display Service Power Steering warning message. Do not replace the steering gear or power steering control module if DTC C047A is set in history. If DTC C047A is current, follow the Circuit/System Testing for proper diagnosis.