Description of the P0555 fault code.
OBD2 Error Codes

P0555 Brake Booster Pressure Sensor Circuit Malfunction

26.05.2022 /

P0555 – OBD-II Trouble Code Technical Description

The trouble code indicates problems in the brake booster pressure sensor circuit.

What does the fault code mean P0555?

Trouble code P0555 indicates problems in the brake booster pressure sensor circuit. This means that the engine control module (PCM) has detected a fault that is preventing this circuit from operating properly. The brake booster pressure sensor is responsible for monitoring the amount of pressure (vacuum) supplied to the brake booster. If the PCM detects that the sensor is not producing the correct voltage output, it will set the P0555 code.

Fault code P0555.

Possible reasons

Some possible causes of the P0555 trouble code:

  • Brake booster pressure sensor malfunction: The sensor itself may be damaged or faulty, causing the brake booster pressure to be read incorrectly.
  • Wiring or Connectors: Problems with the wiring, connections, or connectors can cause opens or shorts in the pressure sensor circuit.
  • PCM malfunction: The engine control module (PCM) may have its own problems that prevent it from correctly interpreting signals from the brake booster pressure sensor.
  • Problems with the vacuum system: If the vacuum system that supplies pressure to the brake booster is not working properly, it can also cause the P0555 code to appear.
  • Other electrical problems: For example, a short circuit in the circuit, corrosion on the contacts, or a broken wire can cause this error.

What are the symptoms of a fault code? P0555?

Some possible symptoms for trouble code P0555:

  • Check Engine Indicator: One of the most common symptoms is the appearance and illumination of the Check Engine light on the vehicle's dashboard.
  • Braking problems: The car may have problems braking as the brake booster may not work properly due to improper pressure.
  • Unusual brake booster sounds: In some cases, unusual sounds or noises may occur in the brake booster area due to improper pressure.
  • Difficulties in management: It may take more force to press the brake pedal, or it may feel too soft or too hard.

How to diagnose a fault code P0555?

The following steps are recommended to diagnose DTC P0555:

  1. Check for symptoms: Look closely for symptoms such as the check engine light, braking problems, and unusual brake power sounds.
  2. Use a diagnostic scanner: Connect a diagnostic scan tool to your vehicle's OBD-II port and read the trouble codes. Verify that the P0555 code is indeed present.
  3. Check the brake booster pressure sensor: Check the condition and connection of the brake booster pressure sensor. Make sure the wires are not broken, the connectors are securely connected, and the sensor itself is not damaged or dirty.
  4. Check the pressure in the brake booster system: Using specialized tools and instruments, check the actual pressure in the brake booster system. Make sure the pressure meets the manufacturer's specifications.
  5. Check wiring: Check the wiring, connections, and connectors in the brake booster pressure sensor circuit for corrosion, opens, or shorts.
  6. Check the brake booster: Check the operation of the brake booster for malfunctions. Make sure he creates the necessary pressure and responds to commands as required.
  7. Carry out the necessary repairs: Depending on the diagnostic results, carry out the necessary repair work, such as replacing the pressure sensor, correcting the wiring, or repairing the brake booster.
  8. Clear error codes: Once repairs have been completed and the problem has been resolved, clear the error codes using a diagnostic scan tool.

Diagnostic errors

When diagnosing DTC P0555, the following errors may occur:

  • Incorrect problem identification: Some diagnostic errors may be due to incorrect identification of the source of the problem. For example, a P0555 code may be mistakenly determined to be due to a faulty pressure sensor when the problem could be in the wiring or the brake booster itself.
  • Faults in other components: Other brake system components may also cause symptoms similar to the P0555 code. For example, faults in the power steering pump or brake booster system can cause problems.
  • Incorrect wiring diagnosis: Wiring, connections, and connectors may be misdiagnosed, which may lead to incorrect conclusions about the condition of the brake booster pressure sensor circuit.
  • Incorrect interpretation of sensor readings: Sometimes readings from a pressure sensor can be misinterpreted, leading to incorrect conclusions about its performance.
  • Problems with diagnostic equipment: Poor or faulty diagnostic equipment can also cause errors when diagnosing the P0555 code.

To prevent these errors, it is important to use reliable diagnostic equipment, follow the manufacturer's diagnostic procedures, and carefully inspect all brake system components when diagnosing.

How serious is the fault code? P0555?

Trouble code P0555, which indicates a problem in the brake booster pressure sensor circuit, is serious because it is related to the performance of the vehicle's braking system. Improper operation of the brake booster can result in poor or complete loss of braking performance, which poses a safety hazard to the driver, passengers, and others. Therefore, drivers should contact a professional auto mechanic for diagnosis and repair if the P0555 code appears on the dashboard and does not resolve properly.

What repair will help eliminate the code? P0555?

Resolving the P0555 trouble code requires diagnosing and possibly repairing the brake booster system components. A few steps that may help resolve this issue:

  1. Checking the brake booster pressure sensor: The first step is to check the sensor itself. This may include checking its connections, resistance and general condition.
  2. Checking wiring and electrical connections: Next, you should check the wiring, connections and connectors associated with the pressure sensor. It may need to be inspected for damage, corrosion or breaks.
  3. Replacing the pressure sensor: If the brake booster pressure sensor is found to be faulty, it can be replaced with a new one. Make sure the new sensor is compatible with your vehicle.
  4. Checking the brake booster: In some cases, the problem may not be with the sensor, but with the brake booster itself. In this case, it will require additional diagnostics and, possibly, repair or replacement.
  5. Clearing errors and re-diagnosis: After repair work is completed, the system should be cleared of fault codes and re-diagnosis should be performed to ensure that the problem has been resolved.

It is recommended that these steps be carried out by an auto mechanic or a qualified professional as working on your vehicle's braking system requires experience and knowledge to avoid further problems and ensure safety.

VW P0555 Brake Booster Pressure Sensor Circuit: How to Fix It!

P0555 – Brand-specific information

Trouble code P0555 can be found on different brands of cars, but the meaning may vary depending on the manufacturer, the meaning for some brands is:

These are just some examples of how the P0555 code can be deciphered for various makes of cars. To accurately interpret the fault code and determine the necessary repairs, it is recommended that you contact your dealer or service technician for your specific vehicle brand.

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