VCBATT_a479 — LVBMS ECPA Not Closed

Full alert identifier: VCBATT_a479_LVBMS_ECPA_NotClosed

Message shown in the car

Connector on low voltage battery is not secured Push or slide locking mechanism until secured

Alert description

The low voltage battery management system (LVBMS) is reporting the low voltage (LV) battery's electronic connector position assurance (E-CPA) is not secure, which could result in the LV battery becoming disconnected from the rest of the vehicle electrical systems. This could occur due to the E-CPA locking tab not being fully pushed down, or communication issues between the LVBMS and vehicle controller.

Potential impact

The LV battery may become (or may already be) disconnected from the rest of the vehicle electrical systems, which would make the LV battery unable to support vehicle electrical systems or to recharge via the power conversion system (PCS).

Set condition

The LVBMS is not communicating as expected with the vehicle controller (MIA) or reports the LV battery's E-CPA is not closed.

Clear condition

The LVBMS is communicating as expected with the vehicle controller (not MIA) and reports the LV battery's E-CPA is closed.

Signals to check

These diagnostic fields are associated with VCBATT_a479. Check the alert's Payload in Service Mode Plus for available values.

Signal	Unit
ECPA State `VCBATT_a479_ECPAState` 0 OPEN 1 CLOSED 2 INVALID 3 SNA	—
FRM 3 Timed Out `VCBATT_a479_FRM3_timedOut`	—
Battery SM State `VCBATT_a479_batterySMState`	—
Factory Mode `VCBATT_a479_factoryMode`	—
Frunk Latch Status `VCBATT_a479_frunkLatchStatus`	—
Service Mode `VCBATT_a479_serviceMode`	—
Transport Mode `VCBATT_a479_transportMode`	—
Vehicle Power State `VCBATT_a479_vehiclePowerState` 0 OFF 1 CONDITIONING 2 ACCESSORY 3 DRIVE	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT_a479.