BMS family
BMS_a172_SW_Isolation_Failure_In_Drive_Warning
Not Available
What does the BMS_a172_SW_Isolation_Failure_In_Drive_Warning alert mean?
The BMS has detected isolation failure conditions in several drive sessions
What you'll see in your Tesla
- Not Available
What triggers it
Isolation or isolation degradation alert is set in several drive sessions
When it clears
SW_Repeated_Isolation_Failure_In_Drive is set OR several drive cycles with no isolation or iso degradation alerts
Potential impact
Vehicle may be unable to restart
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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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.