P0555 Fault Code

Brake Booster Pressure Sensor Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0555 fault code indicates a problem with the Brake Booster Pressure Sensor Circuit. This sensor plays a crucial role in the braking system by measuring the amount of vacuum in the brake booster. It ensures that the brake assist is functioning correctly, providing the driver with optimal braking power. When this sensor is not working properly, it can lead to diminished braking performance, which can be hazardous.

What are the symptoms of the P0555 code?

Symptoms associated with a P0555 code may consist of:

• Warning lights illuminated on the dashboard, such as the brake or check engine light
• A noticeable increase in braking distance
• A feeling of reduced braking assistance, leading to stiffer brake pedal response
• Unusual noises during braking (e.g., hissing sounds from the brake booster area).

What causes the P0555 code?

Common causes of the P0555 code can include:

• A faulty brake booster pressure sensor
• Wiring issues such as shorts or breaks in the harness
• Corroded or poor connections at the sensor terminals
• Vacuum leaks in the brake booster or hose
• Problems with the vehicle's engine control module (ECM) affecting sensor performance.

How to fix P0555?

To resolve the P0555 fault code, consider the following corrective actions:

• Inspect and test the brake booster pressure sensor for proper operation and replace if faulty.
• Check the wiring and connectors for any signs of damage or corrosion, and repair as necessary.
• Look for vacuum leaks in the brake system and make repairs to hoses or fittings if found.
• Clear the fault codes after repairs and conduct a test drive to ensure the issue is resolved.