P0558
PowertrainBrake Systemhigh severityBrake Booster Pressure Sensor Circuit High
What P0558 Means
The signal voltage from the brake booster pressure sensor is higher than the expected threshold. This usually indicates an open circuit or short to voltage.
Symptoms
- Brake warning light on
- Erratic brake assist
- Hard brake pedal
Common Causes
- Open circuit in sensor wiring
- Short to voltage
- Faulty pressure sensor
- Poor ground connection
Diagnostic Steps
- Read stored codes
- Measure sensor signal voltage
- Check for open or short to power
- Replace sensor if wiring is good
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
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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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