Conditions for Clearing 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.

The parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.
The parking brake control module is replaced or the internal temperature drops below the allowed temperature.