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2013 MERCEDES-BENZ ML
4.6L Turbo V8•AWD•AUTOMATIC•gas•M278•turbo
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Repairs0Labor506Torque712Fluid8DTC1855Battery2Maintenance0Recalls0
P0266high severityPowertrain

Cylinder 2 Contribution/Balance

on 2013 Mercedes-Benz ML 4.6L Turbo V8 · AWD

What this code means

The PCM detects that cylinder 2 is not contributing its expected power or fuel balance. This indicates uneven cylinder performance.

Symptoms

  • Rough running
  • Power imbalance
  • Vibration

Common causes

  • Faulty cylinder 2 injector
  • Low compression on cylinder 2
  • Injector wiring fault
  • Mechanical engine issue

Diagnostic steps

  1. Scan and note balance data
  2. Perform cylinder contribution test
  3. Check compression on cylinder 2
  4. Repair injector or address mechanical fault
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