Conditions for Setting the DTC
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
P057B
Brake Pedal Position Sensor = Stuck in range - For greater than 1 s
P057C
Brake Pedal Position Sensor = Less than 0. 25 V - For greater than 1 s
P057D
Brake Pedal Position Sensor = Greater than 4. 75 V - For greater than 1 s
P057E
Brake Pedal Position Sensor = Signal noisy or erratic