2012 BMW 328i Drivetrain Malfunction message. My car seems to always get this message on the Idrive. The car does not go into limp mode and drives normally, but the message still persists even after restarting the car. The only error code I get is 801405 Permanent CON: Undervoltage. Battery reads 12.6 volts with the car off and 13.2 when running. So I assume battery and alternator are fine.
I did notice that two of the buttons on the IDrive do not work, took that apart and cleaned it, now are functioning, however I did see a blown diode on the circuit board, not sure that would cause the message but have ordered a new IDrive knob. Any suggestions?