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2023 BMW M550I
4.4L Twin-Turbo V8•AWD•AUTOMATIC•gas•turbo
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Repairs0Labor485Torque5194Fluid8DTC1489Battery1Maintenance0Recalls0
29CChigh severityPowertrain

Misfire Cylinder 1

on 2023 BMW M550i 4.4L Twin-Turbo V8 · AWD

What this code means

The engine control module detected a misfire on cylinder 1, meaning combustion is incomplete or not happening. This is the BMW equivalent of OBD code P0301.

Symptoms

  • Rough idle
  • Engine shakes or hesitates
  • Check engine light flashing

Common causes

  • Faulty ignition coil
  • Worn spark plug
  • Fuel injector fault
  • Low compression or vacuum leak

Diagnostic steps

  1. Read freeze frame and confirm cylinder 1 misfire
  2. Swap coil and plug to another cylinder
  3. Test injector operation on cylinder 1
  4. Perform compression test on cylinder 1
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