Description of the P0558 fault code.
OBD2 Error Codes

P0558 Brake Booster Pressure Sensor Circuit High Input

26.05.2022 /

P0558 – OBD-II Trouble Code Technical Description

Trouble code P0558 indicates that the brake booster pressure sensor circuit input is high.

What does the fault code mean P0558?

Trouble code P0558 indicates a high input signal to the brake booster pressure sensor circuit. This means that the engine control module (PCM) receives a signal that the brake booster pressure is too high during braking. If the PCM receives a high input signal from the brake booster pressure sensor, it will set a code P0558. The warning light will then come on, requiring several failure cycles.

Fault code P0558.

Possible reasons

Some possible reasons for the P0558 trouble code:

  • The brake booster pressure sensor is faulty.
  • The wiring or connectors connecting the pressure sensor to the engine control module (ECM) are open or shorted.
  • Problems with the engine control module (ECM) itself, causing the pressure sensor signals to be misinterpreted.
  • Insufficient or incorrect brake fluid level, which can lead to increased pressure in the brake booster system.
  • Mechanical problems in the brake booster system, such as clogged brake lines or faulty hydraulic components.

What are the symptoms of a fault code? P0558?

Symptoms when trouble code P0558 appears may include the following:

  • The Check Engine light on the dashboard comes on.
  • Possible problems with the operation of the brake system, such as:
    • Lack of response to pressing the brake pedal.
    • Too much or too little braking.
    • Abnormal sounds or vibrations when braking.
  • Uneven distribution of braking force between the wheels.

It is important to note that symptoms may vary depending on the specific cause and operating conditions of the vehicle.

How to diagnose a fault code P0558?

The following steps are recommended to diagnose DTC P0558:

  1. Check the brake system: Check the operation of the brakes to make sure they do not stick or operate abnormally.
  2. Use a diagnostic scanner: Connect the diagnostic scanner to the OBD-II port and read the trouble codes. Check to see if there are other error codes besides P0558 that may help identify the problem.
  3. Check the brake booster pressure sensor: Check the condition and correct operation of the pressure sensor in the brake booster system. Make sure it is connected correctly and is not damaged.
  4. Check electrical connections: Check the wires and connectors connecting the pressure sensor to the ECU (electronic control unit) for damage, corrosion or breaks.
  5. Check the brake system pressure: Use a pressure gauge to measure the pressure in the brake booster system. Make sure the pressure matches the vehicle manufacturer's recommended values.
  6. Check ECU: If all the above components are in good condition, it is possible that the fault may be related to the electronic control unit (ECU) itself. Check the ECU for correct operation and possible damage.
  7. Professional diagnostics: In case of difficulty or if you are not confident in your diagnostic skills, it is recommended that you contact a qualified auto mechanic or service center for more detailed diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0558, the following errors may occur:

  • Misinterpretation of symptoms: Some symptoms, such as improper brake operation or unusual noises, may be mistakenly attributed to a pressure sensor problem when the cause may be another component of the brake system.
  • Misinterpretation of error code: Some mechanics may misinterpret the error code, which may result in replacing unnecessary parts or performing unnecessary repairs.
  • Insufficient diagnosis: Some mechanics may limit themselves to reading the error code and not perform a deeper diagnosis of the brake booster system, which can lead to hidden problems being missed.
  • Wrong fix: Without a complete diagnosis and understanding of the cause of the P0558 code, incorrect steps may be taken to correct the problem, which will not solve the root cause.

To successfully diagnose and resolve the P0558 code, it is important to conduct a complete and accurate assessment of the condition of the brake booster system, taking into account all possible causes and factors affecting the operation of the pressure sensor.

How serious is the fault code? P0558?

Trouble code P0558 indicates a high input signal from the brake booster pressure sensor circuit. This could mean that the brake pressure sensor is reporting too much pressure in the brake system, which could be hazardous to your driving safety.

The severity of the problem depends on the specific context and symptoms. If high pressure does exist in the brake system, it can lead to insufficient braking, worn brake parts, or even potential accidents.

Therefore, you should immediately contact a qualified technician for diagnosis and repair to avoid possible braking problems and ensure safe driving.

What repair will help eliminate the code? P0558?

To resolve DTC P0558, follow these steps:

  1. Checking the brake booster pressure sensor: Check the condition of the pressure sensor, its connection and the integrity of the wiring. If the sensor is damaged or defective, it must be replaced.
  2. Checking the level and condition of the brake fluid: Make sure the brake fluid level is within the specified range and that it is not contaminated. If the fluid level is low or there are signs of contamination, replace and bleed the brake system.
  3. Checking the brake system: Inspect and test all brake system components, including brake rotors, pads, calipers and brake hoses. Replace any worn or damaged parts.
  4. Electrical circuit diagnostics: Check the electrical circuit connecting the pressure sensor to the engine control module (ECM). Check for opens, shorts, or resistance, and ensure that connectors are working properly.
  5. Replacement or repair of defective components: Once the problem is identified, replace or repair defective components such as the pressure sensor, wiring, or connections.
  6. Clearing the error code: After repairs and troubleshooting, use the vehicle diagnostic scanner to clear error code P0558 from the control module memory.

If you have no experience in car repair or doubt your skills, it is better to contact a professional car service center for diagnostics and repairs.

What is P0558 Engine Code [Quick Guide]

P0558 – Brand-specific information

Trouble code P0558 relates to the brake booster system and can be found in various makes of cars, decoding for some of them:

To obtain accurate information about the P0558 code for your specific vehicle make and model, it is recommended that you consult an official repair manual or an authorized service center for that manufacturer. Technicians will be able to provide detailed information about what this code means for your specific vehicle and what steps you should take to resolve it.

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