VCBATT_a259 — LV Voltage Drop On High Load Current

Full alert identifier: VCBATT_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

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 `VCBATT_a259_IBSTemp`	degC
Max Current Reached `VCBATT_a259_maxCurrentReached`	A
Min Voltage Reached `VCBATT_a259_minVoltageReached`	V
Voltage Drop Counter `VCBATT_a259_voltageDropCounter`	—

Signal	Unit
Service Mode `VCBATT_a259_serviceMode`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT_a259.