BMS family
BMS_a166_SW_Pack_Full_Weld
Not Available
What does the BMS_a166_SW_Pack_Full_Weld alert mean?
The battery management system (BMS) detects that both of the pack contactors are welded.
What you'll see in your Tesla
- Not Available
What triggers it
The BMS detects that both of the pack contactors are welded.
When it clears
The BMS detects that the condition clears.
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.