VCBATT_a477 — LV Battery Unrecoverable By Vehicle

Full alert identifier: VCBATT_a477_LVBatteryUnrecoverableByVehicle

Alert description

The low voltage battery management system (LVBMS) reports the low voltage (LV) battery's internal protection transistor (MOSFET) has opened and it is not recoverable by the vehicle. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool. A separate alert will indicate whether the battery requires replacement.

Potential impact

The LV battery is not recoverable by the vehicle. If recovery via an external charger tool is unsuccessful, replacement will be necessary.

Set condition

The LVBMS reports to the vehicle controller that the LV battery is not recoverable due to any of the following conditions: depleted LV battery state of charge (SoC) due to deep discharge; one or more cell voltage(s) at less than its threshold; the sum of all cell voltages is less than its threshold.

Clear condition

The LV battery is replaced and its internal protection transistor (MOSFET) is detected closed.

Signals to check

Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.

Signal	Unit
Cell 1 Voltage `VCBATT_a477_cell1Voltage`	V
Cell 2 Voltage `VCBATT_a477_cell2Voltage`	V
Cell 3 Voltage `VCBATT_a477_cell3Voltage`	V
Cell 4 Voltage `VCBATT_a477_cell4Voltage`	V
Sum Cell Voltage `VCBATT_a477_sumCellVoltage`	V

Signal	Unit
Deep Discharge Flag `VCBATT_a477_deepDischargeFlag`	—
Frunk Open `VCBATT_a477_frunkOpen`	—
Service Mode `VCBATT_a477_serviceMode`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT_a477.