VCFRONT_a271 — LV Battery Perm Supported

Full alert identifier: VCFRONT_a271_LVBatteryPermSupported

Alert description

After a Low Voltage (LV) Battery condition was identified that may prevent precharging the High Voltage (HV) Bus, the HV Bus successfully energized and will support the LV System to enable drive. The vehicle controller requests to keep the HV bus energized until the LV battery is replaced.

Potential impact

The HV System will remain on to support vehicle functions, including drive, and the HV contactors will remain closed.

Set condition

The failureToPrechargeRisk alert is set, and the HV Bus is energized.

Clear condition

The LV Battery is replaced.

Signals to check

These diagnostic fields are associated with VCFRONT_a271. Check the alert's Payload in Service Mode Plus for available values.

Signal	Unit
Dcr Milli Ohms Above Threshold Trigger `VCFRONT_a271_dcrMilliOhmsAboveThresholdTrigger`	—
Dead LV Minimal Ah Discharged Trigger `VCFRONT_a271_deadLVMinimalAhDischargedTrigger`	—
Instant Precharge DCR Too High Trigger `VCFRONT_a271_instantPrechargeDCRTooHighTrigger`	—
Precharge LV Load Reduction Trigger `VCFRONT_a271_prechargeLVLoadReductionTrigger`	—
Resistance Estimation Hard Fail Trigger `VCFRONT_a271_resistanceEstimationHardFailTrigger`	—
Shorted Cell Test Trigger `VCFRONT_a271_shortedCellTestTrigger`	—
Volt Drop On High Current Trigger `VCFRONT_a271_voltDropOnHighCurrentTrigger`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCFRONT_a271.