VCLEFT_a194 — DCDC Not Supporting LV Bus
Full alert identifier: VCLEFT_a194_DCDCNotSupportingLVBus
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
These diagnostic fields are associated with VCLEFT_a194. Check the alert's Alert Log in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
Bms mia
VCLEFT_
|
— |
HV Blocking Mismatch
VCLEFT_
|
— |
Pcs mia
VCLEFT_
|
— |
Bms State
VCLEFT_
|
— |
Contactor E Fuse Stable
VCLEFT_
|
— |
Dcdc LV Support Status
VCLEFT_
|
— |
Frunk Open
VCLEFT_
|
— |
Hv State
VCLEFT_
|
— |
Show 8 more fields
| Signal | Unit |
|---|---|
Hvc E Fuse Stable
VCLEFT_
|
— |
Not Enough Power For Support
VCLEFT_
|
— |
Pcs E Fuse Stable
VCLEFT_
|
— |
Replace LV Battery
VCLEFT_
|
— |
Service Mode
VCLEFT_
|
— |
Transport Mode
VCLEFT_
|
— |
Vcright E Fuse Stable
VCLEFT_
|
— |
Vehicle Power State
VCLEFT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a194.