P1A1F CADILLAC - Battery Energy Control Module Hybrid Battery System Voltage Low
- Faulty Drive Motor Generator Battery Control Module
- Drive Motor Generator Battery Control Module harness is open or shorted
- Drive Motor Generator Battery Control Module circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1a1f Cadillac DescriptionThe drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the Hybrid Powertrain Control Module (HPCM) through serial data. The hybrid powertrain control module is the host controller for Diagnostic Trouble Code (DTC) information.
The drive motor generator battery control module monitors the calculated battery voltage and the terminal voltage. The calculated voltage represents the sum of the voltages from the 20 individual battery measurements. The terminal voltage represents the total DC bus voltage as measured on the output side of the high voltage contactors.
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