P0559

Brake Booster Pressure Sensor Circuit Intermittent

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–111 (est.)

Symptoms

Increased brake pedal travel
Hard braking
Check Engine Light Is On
Activating the emergency brake system

Causes

Open or shorted wiring harness
Poor contact in the sensor connector
Brake booster pressure sensor malfunction
Damage to the vacuum brake booster
Circuit Grounding Problems

How to Fix

Visual inspection of the sensor wiring harness and connectors
Checking resistance and continuity using a multimeter
Testing the sensor signal with an OBD-II scanner
Replacing the brake booster pressure sensor if necessary
Checking the vacuum booster for leaks

Related codes

P0557 P0558 P0560