BMS family
BMS_f023_SW_Contactors_Open_HWOC
Service is required
What does the BMS_f023_SW_Contactors_Open_HWOC alert mean?
This alert is used as a counter to record the number of hardware overcurrents (HWOC) detected by the battery management system (BMS).
What you'll see in your Tesla
- Service is required
- Schedule service
What triggers it
The BMS detects that the contactors were opened under load because of a HWOC event.
When it clears
The BMS detects that the condition clears.
Potential impact
This alert is primarily informational and is used for logging purposes.
Affected models
Model S 2012-2020
Model X 2015-2020
Track your Tesla's alerts automatically
Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.