BMS family
BMS_u019_Acceleration_Reduced
Acceleration reduced
What does the BMS_u019_Acceleration_Reduced alert mean?
The battery management system (BMS) has limited the maximum discharge current.
What you'll see in your Tesla
- Acceleration reduced
- Performance may be restored on next drive
What triggers it
The BMS detects that the contactor stress estimate has exceeded the grace period threshold.
When it clears
The BMS detects that the contactor stress estimate falls below the grace period threshold.
Potential impact
The maximum discharge current will be linearly ramped down as contactor stress continues to increase.
Affected models
Model S 2012-2020
Model X 2015-2020
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.