BMS family
BMS_a085_SW_Pack_Contactor_Mismatch
Vehicle shutting down - PULL OVER SAFELY
What does the BMS_a085_SW_Pack_Contactor_Mismatch alert mean?
The battery management system (BMS) detects a mismatch between the actual and commanded pack contactor set state.
What you'll see in your Tesla
- Vehicle shutting down - PULL OVER SAFELY
- Operation may be restored on next drive
What triggers it
High voltage processor (HVP) comms are OK and pack contactors were closed and pack contactors are now open / opening and BMS_packContactorRequest has remained closed.
When it clears
HVP_packContactorSetState is correct for the current BMS_packContactorRequest.
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.