DTC U012D-00: Lost Communication With Generator Control Module: General Description

Alternator output and power demand of all electrical loads and systems must be matched to each other as ideally as possible so that the entire system is reliable and trouble-free in operation. The ECM monitors alternator output deviation through LIN communication from the alternator when the engine is running. When ECM (PCM) detects an alternator fault, it request a warning lamp on to cluster through the CAN communication.