VCBATT_a497 — LV Battery Warn Disconnect
Full alert identifier: VCBATT_a497_LVBatteryWarnDisconnect
Message shown in the car
Disconnect low voltage battery to prevent overdischarge Low voltage battery may become unusable
Alert description
The low voltage (LV) battery internal protection transistor (MOSFET) is open, while the LV battery is at low state of charge and recovering the MOSFET is not being attempted. As a result, the low voltage battery management system (LVBMS) continues to draw power from the cells, which may make the LV battery unrecoverable if it is not disconnected soon.
Potential impact
The LV battery may become too deeply discharged and unrecoverable.
Set condition
The LV battery state of charge (SOC) is less than 30%, the LV battery internal protection transistor (MOSFET) is open, and there are no low voltage battery management system (LVBMS) communication or firmware mismatch issues.
Clear condition
The LV battery internal protection transistor (MOSFET) is closed and the LV battery is electrically connected to the vehicle and charging, or the LV battery is disconnected from the wiring harness to prevent further discharge.
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 |
|---|---|
Pack Current
VCBATT_
|
A |
Soc
VCBATT_
|
% |
Sum Cell Voltage
VCBATT_
|
V |
| Signal | Unit |
|---|---|
Factory Mode
VCBATT_
|
— |
Frunk Open
VCBATT_
|
— |
Service Mode
VCBATT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT_a497.