BMS family
BMS_w162_SW_FC_Prechg_Too_Slow
Unable to DC Fast Charge / Supercharge
What does the BMS_w162_SW_FC_Prechg_Too_Slow alert mean?
The battery management system (BMS) has detected that precharge was too slow to allow fast charge (FC).
What you'll see in your Tesla
- Unable to DC Fast Charge / Supercharge
- Disconnect and retry
What triggers it
The BMS detects that the voltage on the DC link bus is rising slower than it should be.
When it clears
The BMS detects that the condition clears.
Potential impact
The vehicle cannot DC FC.
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.