BMS-A146
BMS_a146_SW_Brick_Overdischarged
Also written as BMS_A146 / BMS A146 / BMS_a146_SW_Brick_Overdischarged / bms_a146_sw_brick_overdischarged
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-A146 mean?
Tesla alert code in the Battery Management System (BMS) module. One or more bricks in the HV battery are at too low of a voltage to permit charging BMS detected and recovered from bus off on VEH, HVS or HVI CAN bus The BMS uses this for generic assertions about unexpected conditions An Soc by Ah saturation of >3% occurred while SOC saturation was active All bricks have <1% SOC by Ah saturation BMS is likely overestimating SOC of some bricks due to incorrect CAC or Coulomb counting BMS has detected that one or more bricks' voltage is below the warning threshold
Original Description
One or more bricks in the HV battery are at too low of a voltage to permit charging BMS detected and recovered from bus off on VEH, HVS or HVI CAN bus The BMS uses this for generic assertions about unexpected conditions An Soc by Ah saturation of >3% occurred while SOC saturation was active All bricks have <1% SOC by Ah saturation BMS is likely overestimating SOC of some bricks due to incorrect CAC or Coulomb counting BMS has detected that one or more bricks' voltage is below the warning threshold
Affected Tesla Models
What You May Notice
- BMS-A146 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-A146 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.