DTC P1648 (64): Battery Condition Monitor (BCM) Module Communication Signal Circuit Problem: General Description

Data is transmitted and received between the MCM (motor control module) and the BCM (battery condition monitor) module. Various commands are included in the data stream, and commands are not completed, which is normal, when there is an open in the line or a faulty circuit for the interface. The MCM confirms the validity of the data received according to the parity and check sum, and it measures a time interval during which the command update has not been executed based on updates by the internal timer. If no data update is executed over a set time, a malfunction is detected and a DTC is stored.