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P1572 - Brake Pedal Switch Circuit

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1572 - BRAKE PEDAL SWITCH CIRCUIT

Description:  Indicates the brake input rationality test for brake pedal position (BPP) and brake pressure switch (BPS) has detected a concern. One or both inputs to the powertrain control module (PCM) did not change state when expected. On some vehicles with stability assist, the BPP switch is connected to the anti-lock brake system (ABS) module and the ABS generates a driver brake application (DBA) signal, which is then sent to the PCM.
Possible Causes: 
  • Misadjusted brake switches, BPP or BPS
  • Blown fuse
  • Damaged BPP switch
  • Damaged BPS switch
  • Open or short in the BPP circuit
  • Open or short in the DBA circuit
  • Open or short in the BPS circuit
Diagnostic Aids:  DTC P1572 is set when the PCM does not sense the proper sequence of the brake pedal input signal from both the BPP and BPS switches when the brake pedal is pressed and released.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   - - refer to PINPOINT TEST FD .
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