BMS-A030
BMS_a030_SW_Impedance_Deviation
Also written as BMS_A030 / BMS A030 / BMS_a030_SW_Impedance_Deviation / bms_a030_sw_impedance_deviation
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-A030 mean?
Tesla alert code in the Battery Management System (BMS) module. High impedance was detected on one or more bricks BMS detects that at least one HVC voltage reference was out of bounds BMS has detected an HVIL fault with contactors closed.
Original Description
High impedance was detected on one or more bricks BMS detects that at least one HVC voltage reference was out of bounds BMS has detected an HVIL fault with contactors closed.
Affected Tesla Models
What You May Notice
- BMS-A030 may appear with another Tesla alert in the Battery Management System (BMS) system.
- The vehicle may limit charging, driving, comfort, or safety features depending on the active alerts.
- The alert may clear after sleep, but recurring alerts should be treated as service-relevant.
How to Diagnose and Resolve
- 1 Reboot the vehicle (hold both scroll wheels for 10 seconds)
- 2 Check the Tesla app for any pending software updates
- 3 Monitor the alert over 1–2 charge cycles; schedule service if it recurs
Severity Notes
BMS-A030 is an Alert in the Battery Management System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.