VCLEFT_a559 — LV Battery Low SOC

Full alert identifier: VCLEFT_a559_LVBatteryLowSOC

Alert description

The low voltage battery management system (LVBMS) reports the low voltage (LV) battery has a reduced state of charge (SOC), which may lead to the LVBMS opening the LV battery internal protection transistor (MOSFET).

Potential impact

The LV battery may be unable to support vehicle electrical systems.

Set condition

The LVBMS detects the LV battery SOC is below 15% for 5 seconds.

Clear condition

The LVBMS detects the LV battery SOC is above 20%.

Signals to check

These diagnostic fields are associated with VCLEFT_a559. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Bms mia `VCLEFT_a559_BMS_MIA`	—
HV Blocking Mismatch `VCLEFT_a559_HVBlockingMismatch`	—
Hv up `VCLEFT_a559_HV_UP`	—
Pcs mia `VCLEFT_a559_PCS_MIA`	—
Pack Current `VCLEFT_a559_PackCurrent`	A
Soc `VCLEFT_a559_SOC`	%
Battery SM State `VCLEFT_a559_batterySMState` 0 INIT 1 CHARGE 2 DISCHARGE 3 STANDBY 8 FAULT	—
Bms State `VCLEFT_a559_bmsState`	—

Show 12 more fields

Signal	Unit
Contactor E Fuse Stable `VCLEFT_a559_contactorEFuseStable`	—
Crash Detected `VCLEFT_a559_crashDetected`	—
Dcdc LV Support Status `VCLEFT_a559_dcdcLVSupportStatus` 0 IDLE 1 ACTIVE 2 FAULTED	—
Factory Mode `VCLEFT_a559_factoryMode`	—
Frunk Open `VCLEFT_a559_frunkOpen`	—
Hvc E Fuse Stable `VCLEFT_a559_hvcEFuseStable`	—
Not Enough Power For Support `VCLEFT_a559_notEnoughPowerForSupport`	—
Pcs E Fuse Stable `VCLEFT_a559_pcsEFuseStable`	—
Service Mode `VCLEFT_a559_serviceMode`	—
Transport Mode `VCLEFT_a559_transportMode`	—
Vcright E Fuse Stable `VCLEFT_a559_vcrightEFuseStable`	—
Vehicle Power State `VCLEFT_a559_vehiclePowerState` 0 OFF 1 CONDITIONING 2 ACCESSORY 3 DRIVE	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a559.