Brake Booster Pressure Sensor Circuit Intermittent

Where it lives

For P0559, the sensor sits on the circuit this code reports. The description of P0559 reports a fault at the sensor.

Check these first

• A loose or corroded sensor connector
• A harness rubbed through near the booster
• A failing brake booster pressure sensor
• Air in the brake system
• Low brake fluid

What to do next

1. Wiggle test the sensor harness while watching the signal
2. Inspect the connector for loose or corroded pins
3. Check the harness for rub spots
4. Check brake fluid level and bleed the system
5. Replace the sensor if the signal breaks up
6. Clear the code and retest

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