This is a within the vehicle’s CAN (Controller Area Network) bus system. Specifically, the DME (Digital Motor Electronics – engine control unit) or DDE (Digital Diesel Electronics) reports that it is not correctly receiving a message with ID 0x1A4 from the Electric Machine Electronics – i.e., the control unit for the electric motor.
The iDrive screen displays: "Drivetrain Malfunction. Drive moderately. Full performance not available. Possible to continue journey. Have the problem checked by the service center." bmw error-d52c44
Check the large ground wires near the front chassis for corrosion or loose bolts. This is a within the vehicle’s CAN (Controller