BMS family
BMS_a019_SW_Module_OT
Vehicle system temperature high
What does the BMS_a019_SW_Module_OT alert mean?
A battery management board (BMB) has detected an over temperature condition in a battery module.
What you'll see in your Tesla
- Vehicle system temperature high
- Not Available
What triggers it
A module thermistor has reported a higher temperature than expected.
When it clears
BMB detects that all battery modules are reporting the acceptable level of temperature.
Potential impact
Inability to charge, drive, or support the low voltage (LV) system
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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.