BMS-F021
BMS_f021_SW_Dr_Limits_Regulation
Also written as BMS_F021 / BMS F021 / BMS_f021_SW_Dr_Limits_Regulation / bms_f021_sw_dr_limits_regulation
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does BMS-F021 mean?
Tesla fault code in the Battery Management System (BMS) module. To protect the pack and bricks from overvoltage, undervoltage, and overcurrent conditions, this alert is caused by the following:Regen current is too high.Discharge current is too high.Pack voltage is too high.Pack voltage is too low.Brick voltage is too high.Brick voltage is too low.
Original Description
To protect the pack and bricks from overvoltage, undervoltage, and overcurrent conditions, this alert is caused by the following:Regen current is too high.Discharge current is too high.Pack voltage is too high.Pack voltage is too low.Brick voltage is too high.Brick voltage is too low.
Affected Tesla Models
What You May Notice
- Sudden acceleration or regenerative braking limitations
- Power output reduced without warning
- Multiple battery protection alerts on touchscreen
How to Diagnose and Resolve
- 1 Reduce speed and avoid aggressive acceleration or heavy regenerative braking
- 2 Pull over safely if power is severely limited
- 3 Reboot the vehicle: hold brake + scroll wheels for 10 seconds
- 4 If limits persist after reboot, avoid highway driving and contact Tesla Service
- 5 Technician will check for root cause: cell overvoltage, undervoltage, or overcurrent condition
Severity Notes
BMS-F021 is classified as a Fault, indicating a critical issue in the Battery Management System system. Do not continue driving and contact Tesla Service immediately.