P1EFD GMC - Battery Charger Power Efficiency
- Faulty Battery Charger
- Battery Charger harness is open or shorted
- Battery Charger circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1efd Gmc DescriptionThe battery charger will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery charger to the hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for DTC information.
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