VCLEFT_a477 — LV Battery Unrecoverable By Vehicle
Full alert identifier: VCLEFT_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
These diagnostic fields are associated with VCLEFT_a477. Check the alert's Alert Log in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
Cell 1 Voltage
VCLEFT_
|
V |
Cell 2 Voltage
VCLEFT_
|
V |
Cell 3 Voltage
VCLEFT_
|
V |
Cell 4 Voltage
VCLEFT_
|
V |
Deep Discharge Flag
VCLEFT_
|
— |
Frunk Open
VCLEFT_
|
— |
Service Mode
VCLEFT_
|
— |
Sum Cell Voltage
VCLEFT_
|
V |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a477.