VCBATT1_a221 — Reverse Battery Fault
Full alert identifier: VCBATT1_a221_reverseBatteryFault
Message shown in the car
Electrical system is unable to support all features Schedule service
Alert description
The reverse battery protection transistor is not in its nominal state / functioning as expected. This occurs when an abnormally high amount of current is detected flowing from the low voltage (LV) battery vehicle controller to the LV battery.
Potential impact
The low voltage (LV) electrical system for the vehicle could become unsupported and shut down if power conversion system (PCS) support is also lost
Set condition
The low voltage (LV) battery vehicle controller has detected an issue with the reverse battery protection transistor.
Clear condition
The low voltage (LV) battery vehicle controller no longer detects an issue with the reverse battery protection transistor.
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 Current
VCBATT1_
|
A |
PCS Current
VCBATT1_
|
A |
| Signal | Unit |
|---|---|
Frunk Open
VCBATT1_
|
— |
Service Mode
VCBATT1_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCBATT1_a221.