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2012 MERCEDES-BENZ ML
3.5L V6•AWD•AUTOMATIC•gas•M272
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Repairs0Labor492Torque2165Fluid8DTC1852Battery2Maintenance0Recalls0
P1225low severityPowertrain

Intake Manifold Air Control Solenoid Malfunction

on 2012 Mercedes-Benz ML 3.5L V6 · AWD

What this code means

The ECU detected a malfunction in the intake manifold runner control solenoid. This solenoid controls variable-length intake runners to optimize torque across the RPM range.

Symptoms

  • Check Engine Light
  • Reduced mid-range torque
  • Slight hesitation on acceleration

Common causes

  • Faulty intake runner control solenoid
  • Vacuum leak at solenoid actuator
  • Broken or stuck intake runner flaps
  • Wiring issue to solenoid

Diagnostic steps

  1. Test solenoid operation with scan tool
  2. Inspect vacuum lines to runner actuator
  3. Visually inspect intake runner flaps
  4. Test solenoid resistance
  5. Check wiring

Repair notes

Replace the intake manifold runner control solenoid or repair vacuum lines.

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