DTC Advanced Diagnostics: P0571
DTC P0571:Brake Pedal Position Switch Circuit Malfunction

General Description

The powertrain control module (PCM) detects a brake pedal position switch malfunction by monitoring the signals from the brake pedal position switch. If the PCM continuously inputs an abnormal signal from brake pedal position switch for a specified time during a specified condition, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
–
DTC Type
Two drive cycles, MIL off
 

Enable Conditions
Condition
 
Vehicle
ON mode

Malfunction Threshold
Either of these conditions occurs:
When the brake pedal position switch (STOP SW line) is closed during accelerator pedal position is more than 0 % for 2 seconds or more, the detection counter is incremented. If the detection counter reaches to 15,000 counts or more, the PCM stores a DTC.
When the brake pedal position switch (STOP SW line) is open while the vehicle is decelerated (to 0 mph (0 km/h)) from vehicle speed [VEHICLE SPEED] over 25 mph (40 km/h), the detection counter is incremented. If the detection counter reaches to more than 3 counts, the PCM stores a DTC.

[ ]: HDS Parameter

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Brake pedal position switch STOP SW line open
Brake pedal position switch STOP SW line short to power
Brake pedal position switch STOP SW line short to ground
Brake pedal position switch failure

Confirmation Procedure
Operating Condition
1.
Start the engine, and drive the vehicle at 25 mph (40 km/h) or more.
2.
Decelerate without pressing the brake pedal for at least 2 seconds.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.