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2012 MERCEDES-BENZ ML
3.5L V6•AWD•AUTOMATIC•gas•M272
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Repairs0Labor492Torque2165Fluid8DTC1852Battery2Maintenance0Recalls0
P1335high severityPowertrain

Crankshaft Position Sensor IFI Malfunction

on 2012 Mercedes-Benz ML 3.5L V6 · AWD

What this code means

The ECU detected an Instantaneous Firing Indication (IFI) malfunction from the crankshaft position sensor. The sensor is not providing reliable crankshaft angle data needed for precise fuel injection and ignition timing.

Symptoms

  • Check Engine Light
  • Engine may not start
  • Intermittent stalling
  • Rough running
  • Misfires under load

Common causes

  • Faulty crankshaft position sensor
  • Damaged reluctor wheel
  • Sensor wiring damage
  • Electromagnetic interference
  • Incorrect sensor type installed

Diagnostic steps

  1. Test CKP sensor signal pattern
  2. Inspect reluctor wheel for missing or damaged teeth
  3. Check sensor wiring for damage or interference
  4. Test sensor supply voltage
  5. Verify correct part number

Repair notes

Replace the crankshaft position sensor and inspect the reluctor wheel.

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