Home >> BMW >> 2012 >> 535i Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N55 - Diagnostic Trouble Codes - DTC P0478 (BMW DTC 138101) Through DTC P0440 (BMW DTC 191D01) >> DTC P300D; BMW DTC 138901: Radiator shutter, bottom, electrical: Short circuit to B+ >> Fault code