BMS-A118
BMS_a118_SW_SOC_Balance_Required
Also written as BMS_A118 / BMS A118 / BMS_a118_SW_SOC_Balance_Required / bms_a118_sw_soc_balance_required
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-A118 mean?
Tesla alert code in the Battery Management System (BMS) module. Brick balancing is required before checking dSoc for alpha estimation SOC imbalance exceeds the max threshold for enabling alpha estimation SOC imbalance drops below the threshold for enabling alpha estimation Alpha estimation is disabled until imbalance is resolved
Original Description
Brick balancing is required before checking dSoc for alpha estimation SOC imbalance exceeds the max threshold for enabling alpha estimation SOC imbalance drops below the threshold for enabling alpha estimation Alpha estimation is disabled until imbalance is resolved
Affected Tesla Models
What You May Notice
- BMS-A118 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-A118 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.