Diagnostic Aids
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
DTC C0131 can set if the electronic brake control module is loosely attached to the hydraulic unit. The mountings should be checked for the proper torque.