BMW Boost / Turbo Fault Codes
Charge pipe cracks, wastegate issues, boost leaks on N54/N55/B58/S55.
4 codes in this category.
30FFCharge Air System - Boost Pressure PlausibilityBoost pressure not matching commanded value - boost leak or turbo issue.highP0299Turbocharger UnderboostBoost below target - boost leak, wastegate stuck, or HPFP fueling issue.high2DF1Boost Pressure Above TargetOverboost - typically a wastegate or BOV issue, or aggressive tune.high29DCWastegate Actuator StuckWastegate not moving as commanded - rattle on N55 is classic symptom.moderate