Flash: Battery Pack Control Module (BPCM) Diagnostic and System Updates
This bulletin involves updating the BPCM with the latest available software.
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, the technician may notice one or more of the following DTCs have been set: P0AA1-00 - Hybrid/EV Battery Positive Contactor ?A? Stuck Closed. P0AA4-00 - Hybrid Battery Negative Contactor Circuit Stuck Closed. P0C78-00 - Hybrid/EV Battery System Precharge Time Too Long. P0B3C-00 - Hybrid/EV Battery Voltage Sense 1 Circuit Performance. P0B41-00 - Hybrid/EV Battery Voltage Sense 2 Circuit Performance. P0B46-00 - Hybrid/EV Battery Voltage Sense 3 Circuit Performance. P0B4B-00 - Hybrid/EV Battery Voltage Sense 4 Circuit Performance. P0B50-00 - Hybrid/EV Battery Voltage Sense 5 Circuit Performance. P0B55-00 - Hybrid/EV Battery Voltage Sense 6 Circuit Performance. P1A16-00 - Hybrid/EV Wakeup Control 3 Output Circuit/Open. P1D7B-00 - Hybrid/EV Wakeup Control 3 Output Circuit Short to Battery. P1D7C-00 - Hybrid/EV Wakeup Control 3 Output Circuit Short to Ground. P1A29-00 - Cell Supervisory Circuit A Failure. P1A2A-00 - Cell Supervisory Circuit B Failure. Customer may also experience one or more of the following:Premature oil change message displayed on the cluster and vehicle may be running in fuel/oil refresh mode. Scheduled charging not functioning properly because the battery pack did not wake up while plugged in.
