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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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Repairs0Labor496Torque3165Fluid8DTC1244Battery1Maintenance0Recalls1
P1555critical severityPowertrain

Charge Pressure Upper Limit Exceeded

on 2000 BMW 528i 2.8L I6 M52 · RWD

What this code means

The DME detected that the turbocharger boost pressure has exceeded the maximum allowed limit. This is an overboost condition that can cause severe engine damage if not addressed immediately.

Symptoms

  • Check Engine Light
  • Reduced power mode
  • Overboost felt as sudden power surge
  • Engine may shut down
  • Possible engine knock

Common causes

  • Wastegate stuck closed
  • Boost control solenoid failure
  • Wastegate actuator diaphragm leak
  • Charge pipe leak causing incorrect sensor reading
  • Boost pressure sensor fault

Diagnostic steps

  1. Monitor actual vs target boost pressure
  2. Test wastegate operation manually
  3. Check boost control solenoid
  4. Inspect charge pipes for leaks
  5. Test boost pressure sensor accuracy

Repair notes

Immediately repair the overboost condition to prevent engine damage; check wastegate and boost control solenoid.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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