AutoCodes – Generic – P0559

P0559 Code - Brake Booster Pressure Sensor Circuit Intermittent

Quick Answer

Brake booster pressure sensor is connected to brake booster by a hose. Common causes include Faulty Brake Booster Pressure Sensor, Brake Booster Pressure Sensor harness is open or shorted, Brake Booster Pressure Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0559 indicates Brake Booster Pressure Sensor Circuit Intermittent.
Common causes: Common causes include Faulty Brake Booster Pressure Sensor, Brake Booster Pressure Sensor harness is open or shorted, Brake Booster Pressure Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,575

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0559 Description

Brake booster pressure sensor is connected to brake booster by a hose. It detects brake booster pressure and sends the voltage signal to the Engine Control Module (ECM). The sensor uses a silicon diaphragm which is sensitive to the change in pressure. As the pressure increases, the voltage rises.

OBDII Code P0559 - Brake Booster Pressure Sensor Circuit Intermittent - AutoCodes.com — P0559 Code - Brake Booster Pressure Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0559?

Faulty Brake Booster Pressure Sensor
Brake Booster Pressure Sensor harness is open or shorted
Brake Booster Pressure Sensor circuit poor electrical connection

How to Fix the DTC P0559?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0559 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.