DTC P1648 (75): Motor Control Module (MCM) 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 BCM module measures a time interval during which the command update has not been executed based on updates by the internal timer. If the time interval is beyond a set time, the BCM uses a full-safe value, then provides timing for the MCM to signal a abnormality of the data received from the MCM. The data update is resumed when the normal data is received, and the fail-safe maintains the latest value. If no data updates are executed over a set time, a malfunction is detected and a DTC is stored.