VCFRONT_a192 — Vehicle Load Shed

Full alert identifier: VCFRONT_a192_vehicleLoadShed

Alert description

The low voltage (LV) battery is no longer supported by the power conversion system (PCS). The vehicle low voltage electrical system needs to shed electrical loads by cutting power to some systems / electronic control units (ECUs)

Potential impact

Lead acid: Convenience features such as seat heaters, auxiliary ports, and HVAC will no longer be available. Li-ion: All nonessential features / components will no longer be available, with support reserved for critical functions like operating doors, windows, exterior lights, and front trunk (frunk).

Set condition

Lead acid: low voltage (LV) battery voltage below 12.2V while high voltage (HV) support from the power conversion system (PCS) is requested; Li-ion: low voltage (LV) battery is not supported by the power conversion system (PCS), or the vehicle has experienced a crash event

Clear condition

Lead acid: low voltage (LV) battery voltage above 12.9V and high voltage (HV) state is up; Li-ion: low voltage (LV) battery is supported by the power conversion system (PCS) or, in the case of a crash, the Unified Diagnostic Services (UDS) routine is run successfully

Signals to check

These diagnostic fields are associated with VCFRONT_a192. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Bms mia `VCFRONT_a192_BMS_MIA`	—
DI Gear `VCFRONT_a192_DI_gear` 0 INVALID 1 P 2 R 3 N 4 D 7 SNA	—
GTW Factory Gated `VCFRONT_a192_GTW_factoryGated`	—
GTW Update Started `VCFRONT_a192_GTW_updateStarted`	—
HV Blocking Mismatch `VCFRONT_a192_HVBlockingMismatch`	—
HV Fault Load Shed Active `VCFRONT_a192_HVFaultLoadShedActive`	—
IBS Current `VCFRONT_a192_IBSCurrent`	A
PCS Current `VCFRONT_a192_PCSCurrent`	A

Show 13 more fields

Signal	Unit
Pcs mia `VCFRONT_a192_PCS_MIA`	—
Contactor E Fuse Stable `VCFRONT_a192_contactorEFuseStable`	—
Disconnected 12 V `VCFRONT_a192_disconnected12V`	—
Frunk Open `VCFRONT_a192_frunkOpen`	—
Hv State `VCFRONT_a192_hvState` 0 DOWN 1 COMING UP 2 GOING DOWN 3 UP FOR DRIVE 4 UP FOR CHARGE 5 UP FOR DC CHARGE 6 UP	—
Hvc E Fuse Stable `VCFRONT_a192_hvcEFuseStable`	—
Not Enough Power For Support `VCFRONT_a192_notEnoughPowerForSupport`	—
Pcs E Fuse Stable `VCFRONT_a192_pcsEFuseStable`	—
Post Crash Load Shed Active `VCFRONT_a192_postCrashLoadShedActive`	—
Replace LV Battery `VCFRONT_a192_replaceLVBattery`	—
Service Mode `VCFRONT_a192_serviceMode`	—
Vcright E Fuse Stable `VCFRONT_a192_vcrightEFuseStable`	—
Vehicle Power State `VCFRONT_a192_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 VCFRONT_a192.