Conditions for Setting the DTC
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
The K160 Brake System Control Module detects an internal S91 Parking Brake Control Switch malfunction. The K160 Brake System Control Module detects if the apply or release button was activated for more than 100 s.