Conditions for Setting 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.
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