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DTC P0571: Brake Switch A Circuit

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0571: BRAKE SWITCH A CIRCUIT

Description:  The purpose of this DTC is to check whether the brake switch has toggled or not during the key on engine running (KOER) test.
Possible Causes: 
  • Open or short in the brake pedal position (BPP) circuit
  • Open or short in the stoplamp circuits
  • Concern in module(s) connected to the BPP circuit
  • Damaged brake switch
  • Incorrectly adjusted brake switch
Diagnostic Aids:  Using the scan tool, check the BPP/BOO PID. The BPP/BOO PID should toggle on and off with brake pedal activation.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST FD .
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