BMS family
BMS_a051_SW_HVC_Vref_Bad
Not Available
What does the BMS_a051_SW_HVC_Vref_Bad alert mean?
The Battery Management System (BMS) detects that one or more High Voltage Controller (HVC) voltage references is out of bounds.
What you'll see in your Tesla
- Not Available
What triggers it
There is a significant difference between the BMS and High Voltage Processor (HVP) voltage reference readings.
When it clears
The difference between the BMS and HVP voltage readings are below the maximum threshold.
Potential impact
The vehicle may report inaccurate voltage measurements leading to alerts from the HV 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.