VCLEFT_a404 — Resistance Estimation Hard Failure
Full alert identifier: VCLEFT_a404_resistanceEstimationHardFailure
Alert description
The low voltage (LV) battery internal resistance is too high, based on measured voltage being below the acceptable threshold during a resistance estimation test. Indicates LV battery replacement is necessary.
Potential impact
The LV battery may be unable to support precharge loads / precharge the high voltage (HV) bus, and requires replacement.
Set condition
The LV battery voltage dropped below the lower limit during a resistance estimation test.
Clear condition
The vehicle controller loses all electrical power from the LV battery and power conversion system (PCS), as would happen during LV battery replacement.
Signals to check
These diagnostic fields are associated with VCLEFT_a404. Check the alert's Alert Log in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
IBS Temp
VCLEFT_
|
degC |
Max Current Reached
VCLEFT_
|
A |
Min Voltage Reached
VCLEFT_
|
V |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a404.