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 ON/OFF signals from the brake pedal position switch. If the PCM continuously inputs an ON or OFF 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
5 minutes or more*, Depending on driving conditions**
DTC Type
Two drive cycles, MIL off
* : Symptom 1
** : Symptom 2

Enable Conditions
Condition
 
Vehicle
ON mode
Other*
Accelerator pedal pressed

Malfunction Threshold
Either of these conditions occurs:
Symptom 1
The PCM inputs an ON signal from the brake pedal position switch (STOP LT*3/STOP SW*4 line) for at least 5 minutes when the vehicle speed [VEHICLE SPEED] is at 13 mph (20 km/h) or more.
Symptom 2
The PCM inputs an OFF signal from the brake pedal position switch (STOP LT*3/STOP SW*4 line) for three cycles when the vehicle is stopped (or decelerated to 1 mph (3 km/h) or less) from vehicle speed [VEHICLE SPEED] over 25 mph (40 km/h).

*3: Without multipurpose camera unit
*4: With multipurpose camera unit

[ ]: 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 stuck
Brake pedal position switch STOP LT*3/STOP SW*4 line open (includes poor or loose connection)
Brake pedal position switch STOP LT*3/STOP SW*4 line short to power
Brake pedal position switch STOP LT*3/STOP SW*4 line short to ground
Brake pedal position switch failure
PCM internal circuit failure

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 or by disconnecting the 12 volt battery.