P0559
PowertrainBrake Systemhigh severityBrake Booster Pressure Sensor Circuit Intermittent
What P0559 Means
The signal from the brake booster pressure sensor is dropping out or fluctuating intermittently. This can affect brake assist and stability system operation.
Symptoms
- Brake warning light on
- Inconsistent brake pedal feel
- Stability control fault
Common Causes
- Loose or corroded sensor connector
- Damaged sensor wiring
- Faulty brake booster pressure sensor
- Intermittent short or open in circuit
Diagnostic Steps
- Scan for stored and freeze-frame data
- Inspect sensor connector and wiring for damage
- Wiggle-test harness while monitoring live data
- Replace sensor if signal drops confirmed
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Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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