BMS family
BMS_a059_SW_Pack_Voltage_Sensing
Vehicle may not restart
What does the BMS_a059_SW_Pack_Voltage_Sensing alert mean?
The battery management system (BMS) detects a mismatch between the pack voltage and the sum of brick voltages.
What you'll see in your Tesla
- Vehicle may not restart
- Service is required
What triggers it
The BMS detects that the HV pack voltage differs from the sum of the brick voltages by more than 3%.
When it clears
The BMS detects that the HV pack voltage is within 3% of the sum of the brick voltages.
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.