P0558high severityPowertrain
Brake Booster Pressure Sensor Circuit High
on 2017 Audi S5 3.0L Supercharged V6 · AWD
What this code 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
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