BMS family
BMS_a124_Battery_Coolant_Flood
Unable to charge
What does the BMS_a124_Battery_Coolant_Flood alert mean?
The battery management system (BMS) detects that there is a coolant flood in the high voltage battery.
What you'll see in your Tesla
- Unable to charge
- Service is required
What triggers it
The BMS detects that isolation dropped below the minimum threshold when pack contactors are open and the low coolant signal is active.
When it clears
The BMS detects that isolation is above the minimum threshold when pack contactors are open and the low coolant signal is not active.
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.