BMS family
BMS_a036_SW_HvpHvilFault
Vehicle may not restart
What does the BMS_a036_SW_HvpHvilFault alert mean?
The battery management system (BMS) has detected that the high voltage interlock loop (HVIL) is shorted with the contactors closed.
What you'll see in your Tesla
- Vehicle may not restart
- Service is required
What triggers it
The BMS detects that HVIL voltage is lower than expected.
When it clears
The BMS detects that HVIL voltage is normal.
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+
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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.