Conditions for Setting the DTC
WARNING: This page is about a different car, the 2017 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
P057B
ECM detects the brake pedal position sensor signal is stuck in a range for less than 1 s.
P057C
BPP sensor voltage is less than 0.25 V for 1 s.
P057D
BPP sensor voltage is greater than 4.75 V for 1 s.