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2006 MERCEDES-BENZ ML
5.0L V8•AWD•AUTOMATIC•gas•M113
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Repairs0Labor505Torque2203Fluid8DTC1774Battery2Maintenance0Recalls0
P1470high severityPowertrain

Boost Pressure Control Malfunction

on 2006 Mercedes-Benz ML 5.0L V8 · AWD

What this code means

The ECU detected a malfunction in the turbocharger boost pressure control system. The actual boost pressure does not match the commanded value, indicating a control system failure.

Symptoms

  • Check Engine Light
  • Loss of power
  • Reduced power mode
  • Overboost or underboost condition
  • Turbo surge or whistle

Common causes

  • Faulty wastegate actuator
  • Boost control solenoid failure
  • Vacuum line leak to wastegate
  • Wastegate stuck open or closed
  • Turbocharger bearing failure

Diagnostic steps

  1. Monitor commanded vs actual boost pressure
  2. Test wastegate actuator movement
  3. Check boost control solenoid
  4. Inspect vacuum lines
  5. Check turbocharger shaft play

Repair notes

Replace the faulty boost control component; inspect turbocharger for damage.

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