VCLEFT_a259 — LV Voltage Drop On High Load Current
Full alert identifier: VCLEFT_a259_LVVoltageDropOnHighLoadCurrent
Alert description
The vehicle controller detects the low voltage (LV) battery voltage is lower than expected during a precharge event. When this occurs too many times, separate alerts will also be present to indicate precharging the high voltage (HV) bus may not succeed and the LV battery may need replacement.
Potential impact
The LV battery may be unable to support vehicle electrical systems, including precharging the high voltage (HV) bus.
Set condition
An instant resistance check of the LV battery connections to the vehicle controller does not succeed (does not return a healthy result). Alert log signal data should provide more information on specifics, including load current, LV battery temperature, and any detected voltage dip.
Clear condition
Clears automatically.
Signals to check
These diagnostic fields are associated with VCLEFT_a259. 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 |
Service Mode
VCLEFT_
|
— |
Voltage Drop Counter
VCLEFT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a259.