Home >> BMW >> 2013 >> 335i 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N55 - Diagnostic Trouble Codes - DTC P0617 (BMW DTC 1F1B40) Through DTC U1128 (BMW DTC CDC304) >> DTC P15CF; BMW DTC 215901: Intelligent battery sensor (IBS): Incorrect version >> Fault code