P0559 Intermittent signal in the brake booster pressure sensor circuit

P0559 – OBD-II Trouble Code Technical Description

Trouble code P0559 indicates an intermittent signal in the brake booster pressure sensor circuit.

What does the fault code mean P0559?

Trouble code P0559 indicates an intermittent signal in the brake booster pressure sensor circuit. This means that the vehicle's control module has detected a problem with the signal transmission from the pressure sensor. The brake booster pressure sensor is needed to provide easier braking because the car's computer uses its data. The sensor sends a voltage input signal to the engine control module (PCM). If the PCM receives an abnormal voltage input signal, it will cause P0559 to appear.

Possible reasons

Some possible reasons for the P0559 trouble code:

• Defect or damage to the pressure sensor in the brake booster system.
• The wiring or connectors associated with the pressure sensor have breaks, shorts, or other electrical problems.
• There is a malfunction in the engine control module (PCM) itself, which receives and processes signals from the pressure sensor.
• Incorrect operation of other components that affect the operation of the brake booster system, such as the booster pump or valve.
• Problems with the vehicle's electrical system, such as low voltage or improper grounding.

To accurately determine the cause, it is necessary to conduct a detailed diagnosis of the brake booster system using diagnostic equipment.

What are the symptoms of a fault code? P0559?

Symptoms for DTC P0559 may include the following:

• Unusual sensations when braking: You may notice that the car brakes in an unusual way when you press the brake pedal, or that the brakes respond slower or too harshly.
• The Check Engine light comes on: When an error is detected, the engine management (PCM) will store trouble code P0559 and illuminate the Check Engine light on the instrument panel.
• Unstable operation of the brake booster: The brake booster may be unstable or not work at all due to problems with the pressure sensor.
• The car can remain in one position: In some cases, problems with the pressure sensor can cause the car to remain in one position when you press the brake pedal.
• Deterioration in fuel economy: If your brake booster is ineffective due to a problem with the pressure sensor, it can cause increased fuel consumption by requiring you to press harder on the brake pedal to stop the vehicle.

How to diagnose a fault code P0559?

The following steps are recommended to diagnose DTC P0559:

1. Checking connections: The first step is to check all electrical connections associated with the brake booster pressure sensor. Make sure all connectors are securely connected and show no signs of corrosion or damage.
2. Checking the pressure sensor: Use a multimeter to check the resistance or voltage at the pressure sensor terminals. Compare the values ​​obtained with the manufacturer's recommended values.
3. Circuit check: Check the pressure sensor circuit for shorts or opens. This can be done using the continuity tester.
4. PCM diagnostics: If necessary, diagnose the engine control module (PCM) using specialized equipment to scan the vehicle system and read error codes.
5. Checking the brake system: Check the brake system for other problems that could cause the P0559 code. Make sure the brake fluid level is normal and there are no leaks detected.
6. Checking the brake system pressure: Use specialized equipment to measure brake system pressure. Check that the measured pressure matches the manufacturer's recommended values.

After completing these steps, you can determine the cause and resolve the P0559 code. If you are unsure of your skills or do not have the necessary equipment, it is recommended that you contact a professional auto mechanic for diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0559, the following errors may occur:

• Misinterpretation of symptoms: Some symptoms, such as unusual braking behavior or brake booster instability, may be caused by problems other than just a faulty pressure sensor. Misinterpretation of symptoms may lead to incorrect diagnosis and repair.
• Faulty wiring or connectors: Problems with the wiring or connectors connecting the pressure sensor to the PCM can result in erroneous signals or communication failures. Checking the wiring for damage, corrosion, or breaks is an important step in diagnosing this problem.
• Problems with the pressure sensor itself: If the brake booster pressure sensor itself is faulty, it can cause a P0559 code to appear. Checking the sensor for functionality and its correct connection are also important for successful diagnostics.
• PCM Problems: In rare cases, the problem may be with the engine control module (PCM) itself. Checking the PCM for failures or damage may be necessary to fully diagnose and resolve the problem.

It is important to carry out thorough diagnostics to eliminate possible errors and ensure correct and effective troubleshooting.

How serious is the fault code? P0559?

Trouble code P0559, which indicates an intermittent signal in the brake booster pressure sensor circuit, can be serious, especially if it affects the operation of the brake booster. A faulty brake booster can lead to unpredictable braking and potentially dangerous driving conditions.

Additionally, the Check Engine light that illuminates when this error code appears indicates potential problems with the engine management system, which could also be serious.

It is important to contact a qualified technician immediately to diagnose and correct the problem to ensure the safety and proper operation of the vehicle.

What repairs will resolve P0559?

To resolve DTC P0559, follow these steps:

1. Inspect Wiring and Connections: A technician should inspect the brake booster pressure sensor wiring and connections for damage, corrosion, or breaks. If necessary, repair or replace damaged wires or connectors.
2. Checking the pressure sensor itself: The pressure sensor may be faulty and require replacement. The technician should check its functionality and, if necessary, replace it with a new one.
3. Diagnosis of the Brake Booster System: Some problems with the brake booster can cause the P0559 code to appear. Checking the operation of the brake booster and its components, such as the vacuum pump or electric pump, may be necessary to identify additional problems.
4. Clearing the Error Code: After performing the repair and fixing the problem, the technician should clear the error code using a diagnostic scanner.
5. Retest: After completing the repairs and clearing the error code, you should test drive and retest to ensure that the problem is completely resolved.

It is important that repairs are performed only by a licensed auto mechanic or auto repair professional to ensure the safety and proper functioning of the vehicle.

What is P0559 Engine Code [Quick Guide]

P0559 – Brand-specific information

Trouble code P0559 relates to the brake booster system and can be applied to various makes of vehicles, a list of some of them:

• Toyota: Intermittent signal in the brake booster pressure sensor circuit.
• Honda: Intermittent signal from the brake booster pressure sensor.
• Ford: Intermittent signal from the brake booster pressure sensor.
• Chevrolet: Intermittent signal from the brake booster pressure sensor.
• Nissan: Intermittent signal from the brake booster pressure sensor.
• Volkswagen: Intermittent signal from the brake booster pressure sensor.
• BMW: Intermittent signal from the brake booster pressure sensor.
• Mercedes-Benz: Intermittent signal from the brake booster pressure sensor.

This is just a small list of car brands to which this fault code may apply. The decoding of the code may vary slightly depending on the model and year of manufacture of the car. It is recommended that you consult the repair manual for your specific vehicle make and model for accurate information.