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2010 BMW M3 E90
4.0L V8 S65•RWD•DCT•gas•S65B40
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Repairs0Labor493Torque3437Fluid8DTC1459Battery1Maintenance0Recalls0
P3005critical severityPowertrain

Turbo/Supercharger Wastegate Actuator Stuck Closed

on 2010 BMW M3 E90 4.0L V8 S65 · RWD

What this code means

The wastegate actuator is stuck in the closed position, causing excessive boost pressure. This is a critical condition that can cause engine damage.

Symptoms

  • Check Engine Light
  • Overboost condition
  • Engine knock/detonation
  • Boost pressure beyond specification
  • Possible engine damage if not addressed
  • Fuel enrichment at full boost

Common causes

  • Wastegate actuator rod seized closed
  • Actuator solenoid stuck energized
  • Wastegate valve carbon welded shut
  • Control rod bent or binding
  • PCM commanding max boost erroneously

Diagnostic steps

  1. Check boost pressure immediately - compare to spec
  2. Inspect wastegate actuator rod movement
  3. Test actuator solenoid de-energized state
  4. Check for carbon deposits seizing valve
  5. Review PCM boost target values

Repair notes

Immediately address to prevent engine damage. Replace wastegate actuator. Inspect turbo and engine for damage from overboost.

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