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.
C0558 55
The parking brake control module detects a calibration malfunction.
C0558 5A
The parking brake control module detects mechanical problems with the parking brake system.