DTC 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 | 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 brake pedal position switch (BRK DIAG line) is closed for at least 5 minutes when the vehicle speed [Vehicle Speed] is at 13 mph (20 km/h) or more.
- Symptom 2
The brake pedal position switch (BRK DIAG line) is open 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).
[ ]: HDS Parameter
Possible Cause
- Brake pedal position switch stuck
- Brake pedal position switch BRK DIAG line open (includes a loose or disconnected connector)
- Brake pedal position switch BRK DIAG line short to power
- Brake pedal position switch BRK DIAG 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.