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2000 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas•M52B28
1 active safety recall on this vehicle — view recalls
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Repairs0Labor495Torque3158Fluid8DTC1997Battery1Maintenance0Recalls1
P0558high severityPowertrain

Brake Booster Pressure Sensor Circuit High

on 2000 BMW 528i 2.8L I6 M52 · RWD

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

  1. Read stored codes
  2. Measure sensor signal voltage
  3. Check for open or short to power
  4. Replace sensor if wiring is good
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