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2012 MERCEDES-BENZ ML
3.5L V6•AWD•AUTOMATIC•gas•M272
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Repairs0Labor492Torque2165Fluid8DTC1852Battery2Maintenance0Recalls0
P1300high severityPowertrain

Crankshaft Position Sensor Left Malfunction

on 2012 Mercedes-Benz ML 3.5L V6 · AWD

What this code means

The ECU detected a malfunction in the crankshaft position sensor on the left bank. Mercedes V-engines use dual crankshaft sensors, and this sensor provides timing information for the left cylinder bank.

Symptoms

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

Common causes

  • Faulty crankshaft position sensor
  • Damaged sensor wiring
  • Corroded connector
  • Tone wheel contamination or damage
  • Sensor air gap incorrect

Diagnostic steps

  1. Test sensor signal with oscilloscope
  2. Inspect sensor wiring and connector
  3. Check tone wheel condition
  4. Verify sensor air gap
  5. Swap with known-good sensor

Repair notes

Replace the crankshaft position sensor on the left bank.

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