DTC P0571 (2025)

DTC P0571  : Brake Pedal Position Switch Circuit Malfunction

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
• If the accelerator pedal is pressed with pressing the brake pedal lightly and continuously for 5 minutes or more, this DTC will be stored.

DTC (PGM-FI)

1. Brake lights check 1

   -1. Check the brake lights without the brake pedal pressed.

   Do the brake lights stay on?

   YES 

   Go to step 9.

   NO 

   Go to step 2.

2. Brake lights check 2

   -1. Check the brake lights with the brake pedal pressed.

   Do the brake lights come on?

   YES 

   Go to step 3.

   NO 

   Go to step 5.

3. Brake pedal position switch signal check

   -1. Turn the vehicle to the ON mode.

   -2. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   BRAKE SWITCH

   Does the signal change ON and OFF when the brake pedal is pressed and released?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the brake pedal position switch and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .

   NO 

   Go to step 4.

4. Open wire check (STOP SW line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Disconnect the following connector.

   PCM connector A (50P)

   -4. Press the brake pedal, and measure the voltage between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode

   PCM connector A (50P): disconnected

   Brake pedal: pressed

   Test point 1

   PCM connector A (50P) No. 32 - Refer to: PCM CONNECTOR FOR INPUTS AND OUTPUTS

   Test point 2

   Body ground

   Is there battery voltage?

   YES 

   The STOP SW wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0571 goes away and the PCM was substituted, replace the original PCMPCM REMOVAL AND INSTALLATION .

   NO 

   Repair an open in the STOP SW wire between the PCM (A32) and the brake pedal position switch.

5. Brake pedal position switch check

   -1. Test the brake pedal position switch BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST .

   Is the brake pedal position switch normal?

   YES 

   Go to step 6.

   NO 

   Replace the brake pedal position switch BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST .

6. Fuse check

   -1. Check the following fuse.

   Fuse

   No. B19 - Refer to: FUSE TO COMPONENTS INDEX (2021 2022 2023 2024 2025) .

   Is the fuse OK?

   YES 

   Go to step 7.

   NO 

   Replace the No. B19 fuse. Also check for a short to ground on the No. B19 fuse circuit if needed.

7. Open wire check (+B STOP line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode

   Test point 1

   Brake pedal position switch 4P connector (female terminals) No. 2:

   Test point 2

   Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The +B STOP wire is OK. Go to step 8.

   NO 

   Repair an open in the +B STOP wire between the No. B19 fuse - Refer to: FUSE TO COMPONENTS INDEX (2021 2022 2023 2024 2025) and the brake pedal position switch.

8. Open wire check (STOP SW line)

   -1. Jump the SCS line with the HDS, and wait more than 1 minute.

   -2. Disconnect the following connector.

   PCM connector A (50P)

   -3. Press the brake pedal, and measure the voltage between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode

   PCM connector A (50P): disconnected

   Brake pedal: pressed

   Test point 1

   PCM connector A (50P) No. 32 - Refer to: PCM CONNECTOR FOR INPUTS AND OUTPUTS

   Test point 2

   Body ground

   Is there battery voltage?

   YES 

   The STOP SW wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0571 goes away and the PCM was substituted, replace the original PCM PCM REMOVAL AND INSTALLATION .

   NO 

   Repair an open in the STOP SW wire between the PCM (A32) and the brake pedal position switch.

9. Brake pedal position switch installation check

   -1. Remove the brake pedal position switch with the connector is connected BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST .

   -2. Check the brake lights with the rod of the brake pedal position switch pressed.

   Do the brake lights go off?

   YES 

   Install the brake pedal position switch BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST and adjust the pedal height - Refer to: BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT .

   NO 

   Go to step 10.

10. Brake pedal position switch check

    -1. Test the brake pedal position switch BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST .

    Is the brake pedal position switch normal?

    YES 

    The brake pedal position switch is OK, repair a short to power in the STOP SW wire between the PCM (A32) and the brake pedal position switch.

    NO 

    Replace the brake pedal position switch BRAKE PEDAL POSITION SWITCH REMOVAL, INSTALLATION, AND TEST .