This bulletin applies to 2018 BMW F22, F23, F30, F31, F32, F33, F34, F36, G01, G12, G30 and G32 vehicles.
The engine may run rough or hesitate when accelerating from a stationary position. Fault code FC 21A02D (combustion control, valve lift correction when at idle) may be stored in the DME memory.
A software error in the DME (digital motor electronics) may be the cause. Update the vehicle software using ISTA 4.27.10 or higher. Always connect a BMW-approved battery charger/power supply when performing programming.