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DTC P0555 (2016 With Auto Idle Stop System)

DTC P0555  : Brake Booster Pressure Sensor A Circuit High Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information. - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)
DTC Description DTC Freeze Frame
P0555 Brake Booster Pressure Sensor A Circuit High Voltage    

DTC (EVPS)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

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

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE More than 4.71 V    

    Do the current condition(s) match the threshold?

    YES 

    Go to step 2.

    NO 

    Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the brake booster pressure sensor and the PCM.

  2. Determine possible failure area (MPMON line shorted, others)

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

    - 2. Disconnect the following connector.

    Brake booster pressure sensor 3P connector

    - 3. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      Brake booster pressure sensor 3P connector: disconnected
    Test point 1 Brake booster pressure sensor 3P connector No. 1
    Test point 2 Brake booster pressure sensor 3P connector No. 2
    GHH319153Courtesy of HONDA, U.S.A., INC.

    Is there 4.8 V or more?

    YES 

    Go to step 3.

    NO 

    Go to step 5.

  3. Shorted wire check (MPMON line to power)

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

    - 2. Short the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector A (51P)

    - 4. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector No. 2
    Test point 2 Body ground
    GHH319154Courtesy of HONDA, U.S.A., INC.

    Is there 0.5 V or more?

    YES 

    Repair a short to power in the MPMON wire between PCM connector A (51P) terminal No. 36 and the brake booster pressure sensor.

    NO 

    Go to step 4.

  4. Brake booster pressure sensor check (substitution)

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

    - 2. Substitute a known-good brake booster pressure sensor.

    - 3. Reconnect the following connectors.

    Brake booster pressure sensor 3P connector
    PCM connector A (51P)

    - 4. Turn the vehicle to the ON mode.

    - 5. Clear the DTC with the HDS.

    - 6. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

    - 7. Check for DTCs with the HDS.

    DTC Description DTC Freeze Frame
    P0555 Brake Booster Pressure Sensor A Circuit High Voltage    

    Is DTC P0555 indicated?

    YES 

    Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) or PCM Removal and Installation (2016) .

    NO 

    Replace the original brake booster pressure sensor .

  5. Determine possible failure area (MPMON line, others)

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

    - 2. Connect terminals A and B with a jumper wire.

    Terminal A Brake booster pressure sensor 3P connector No. 2
    Terminal B Body ground
    GHH319155Courtesy of HONDA, U.S.A., INC.

    - 3. Turn the vehicle to the ON mode.

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

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE Less than 0.1 V    

    Do the current condition(s) match the threshold?

    YES 

    Go to step 6.

    NO 

    Go to step 8.

  6. Brake booster pressure sensor check

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

    - 2. Connect terminals A and B with a jumper wire.

    Terminal A Brake booster pressure sensor 3P connector No. 1
    Terminal B Brake booster pressure sensor 3P connector No. 2
    GHH319156Courtesy of HONDA, U.S.A., INC.

    - 3. Turn the vehicle to the ON mode.

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

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE Less than 0.1 V    

    Do the current condition(s) match the threshold?

    YES 

    Replace the brake booster pressure sensor .

    NO 

    Go to step 7.

  7. Open wire check (SG7 line)

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

    - 2. Short the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector A (51P)

    - 4. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector No. 1
    Test point 2 PCM connector A (51P) No. 20 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2016)
    GHH319157Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) , then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016) .

    NO 

    Repair an open in the SG7 wire between PCM connector A (51P) terminal No. 20 and the brake booster pressure sensor.

  8. Open wire check (MPMON line)

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

    - 2. Short the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector A (51P)

    - 4. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector No. 2
    Test point 2 PCM connector A (51P) No. 36 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2016)
    GHH319158Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) , then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016) .

    NO 

    Repair an open in the MPMON wire between PCM connector A (51P) terminal No. 36 and the brake booster pressure sensor.

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