VCLEFT_a371 — Failure To Precharge Risk

Full alert identifier: VCLEFT_a371_failureToPrechargeRisk

Alert description

Based on historical data, the vehicle controller determines there is a high probability the low voltage (LV) battery will not successfully precharge the high voltage (HV) bus.

Potential impact

The high voltage electrical system will remain on to support vehicle functions including drive (HV contactors will remain closed), causing the vehicle show greater range loss over time than expected.

Set condition

Any of the following alerts: 4 instances of LVVoltageDropOnHighLoadCurrent; one instance of shortedCell; one instance of deadLVMinimalAhDischarged; one instance of resistanceEstimationHardFailure; one instance of dcrMilliOhmsAboveThreshold; one instance of prechargeLVLoadReduction.

Clear condition

LV battery replacement should clear this alert.

Signals to check

These diagnostic fields are associated with VCLEFT_a371. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Dcr Milli Ohms Above Threshold Trigger `VCLEFT_a371_dcrMilliOhmsAboveThresholdTrigger`	—
Dead LV Minimal Ah Discharged Trigger `VCLEFT_a371_deadLVMinimalAhDischargedTrigger`	—
Instant Precharge DCR Too High Trigger `VCLEFT_a371_instantPrechargeDCRTooHighTrigger`	—
Precharge LV Load Reduction Trigger `VCLEFT_a371_prechargeLVLoadReductionTrigger`	—
Resistance Estimation Hard Fail Trigger `VCLEFT_a371_resistanceEstimationHardFailTrigger`	—
Shorted Cell Test Trigger `VCLEFT_a371_shortedCellTestTrigger`	—
Volt Drop On High Current Trigger `VCLEFT_a371_voltDropOnHighCurrentTrigger`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a371.