VCFRONT_a180 — DCDC Not Supporting LV Bus
Full alert identifier: VCFRONT_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
VCFRONT_
|
V |
Target PCS Voltage
VCFRONT_
|
V |
| Signal | Unit |
|---|---|
Bms mia
VCFRONT_
|
— |
HV Blocking Mismatch
VCFRONT_
|
— |
Pcs mia
VCFRONT_
|
— |
Bms State
VCFRONT_
|
— |
Contactor E Fuse Stable
VCFRONT_
|
— |
Dcdc LV Support Status
VCFRONT_
|
— |
Frunk Open
VCFRONT_
|
— |
Hv State
VCFRONT_
|
— |
Show 8 more fields
| Signal | Unit |
|---|---|
Hvc E Fuse Stable
VCFRONT_
|
— |
Not Enough Power For Support
VCFRONT_
|
— |
Pcs E Fuse Stable
VCFRONT_
|
— |
Replace LV Battery
VCFRONT_
|
— |
Service Mode
VCFRONT_
|
— |
Transport Mode
VCFRONT_
|
— |
Vcright E Fuse Stable
VCFRONT_
|
— |
Vehicle Power State
VCFRONT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCFRONT_a180.