BMS family
BMS_a170_SW_Limp_Mode
Acceleration and top speed reduced
What does the BMS_a170_SW_Limp_Mode alert mean?
The battery management system (BMS) has reduced power for driving.
What you'll see in your Tesla
- Acceleration and top speed reduced
- Performance may be restored on next drive
What triggers it
The BMS detects a condition that requires it to put the vehicle in limp mode.
When it clears
The BMS detects that the condition clears.
Potential impact
Power is reduced.
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.