VCBATT_a180 — DCDC Not Supporting LV Bus

Full alert identifier: VCBATT_a180_DCDCNotSupportingLVBus

Message shown in the car

Electrical system power reduced Vehicle may shut down unexpectedly

Alert description

The low voltage (LV) bus and LV battery are not adequately supported by the power conversion system (PCS).

Potential impact

The low voltage electrical system cannot continue to power all vehicle features when the LV bus is not adequately supported. It may be necessary to shed some vehicle electrical loads by cutting power to less essential electronic control units (ECUs), and another alert will be present to indicate that condition. Vehicle may be unable to drive or continue driving, with another alert present to indicate that condition.

Set condition

There is 0.5V or greater difference between the PCS voltage and the LV battery voltage.

Clear condition

There is less than 0.5V difference between the PCS voltage and the LV battery voltage.

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
IBS Voltage `VCBATT_a180_IBSVoltage`	V
Target PCS Voltage `VCBATT_a180_targetPCSVoltage`	V

Signal	Unit
Bms mia `VCBATT_a180_BMS_MIA`	—
HV Blocking Mismatch `VCBATT_a180_HVBlockingMismatch`	—
Pcs mia `VCBATT_a180_PCS_MIA`	—
Bms State `VCBATT_a180_bmsState`	—
Contactor E Fuse Stable `VCBATT_a180_contactorEFuseStable`	—
Dcdc LV Support Status `VCBATT_a180_dcdcLVSupportStatus` 0 IDLE 1 ACTIVE 2 FAULTED	—
Frunk Open `VCBATT_a180_frunkOpen`	—
Hv State `VCBATT_a180_hvState` 0 DOWN 1 COMING UP 2 GOING DOWN 3 UP FOR DRIVE 4 UP FOR CHARGE 5 UP FOR DC CHARGE 6 UP	—

Show 8 more fields

Signal	Unit
Hvc E Fuse Stable `VCBATT_a180_hvcEFuseStable`	—
Not Enough Power For Support `VCBATT_a180_notEnoughPowerForSupport`	—
Pcs E Fuse Stable `VCBATT_a180_pcsEFuseStable`	—
Replace LV Battery `VCBATT_a180_replaceLVBattery`	—
Service Mode `VCBATT_a180_serviceMode`	—
Transport Mode `VCBATT_a180_transportMode`	—
Vcright E Fuse Stable `VCBATT_a180_vcrightEFuseStable`	—
Vehicle Power State `VCBATT_a180_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 VCBATT_a180.