VCBATT1_a404 — Resistance Estimation Hard Failure
Full alert identifier: VCBATT1_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
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 Temp
VCBATT1_
|
degC |
Max Current Reached
VCBATT1_
|
A |
Min Voltage Reached
VCBATT1_
|
V |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT1_a404.