SERVICE ENGINE SOON (MIL) - SME FC 21F20D. Malfunction Indicator Lamp (MIL) is illuminated. The following codes may be stored in the fault memory of the battery management electronics (SME). 21F20D - SME, safety concept: Switch-off of switch contactors by safety circuit 21F1F6 - High-voltage battery, switch contactors: Switch-off after a fault Software bug: erroneous fault code stored in SME.
