Conditions for Setting the DTC

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.

Internal pressure sensor fault.
The electronic brake control module detects the brake pressure is increasing when braking, and did not receive a message that the brake pedal is applied.
The electronic brake control module detects the brake pressure does not increase when braking, when it received a message that the brake pedal is applied.