Diagnostic 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.

Verify the parking brake control module software and calibrations are the newest available versions.
Verify the parking brake cable and related hardware is not broken, seized or pinched.