BMS-U018
BMS_u018_SOC_Imbalance_Limiting
Also written as BMS_U018 / BMS U018 / BMS_u018_SOC_Imbalance_Limiting / bms_u018_soc_imbalance_limiting
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-U018 mean?
Tesla unknown code in the Battery Management System (BMS) module. Internal condition to HV battery requiring limiting max allowed brick voltage. This alert was formerly named BMS_u018_Max_Charge_Limited in firmware versions prior to develop/2020.32. If BMS_u018_Max_Charge_Limited appears on the vehicle or in the logs, update the vehicle firmware to the current version.
Original Description
Internal condition to HV battery requiring limiting max allowed brick voltage. This alert was formerly named BMS_u018_Max_Charge_Limited in firmware versions prior to develop/2020.32. If BMS_u018_Max_Charge_Limited appears on the vehicle or in the logs, update the vehicle firmware to the current version.
Affected Tesla Models
What You May Notice
- BMS-U018 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-U018 is a diagnostic or informational code in the Battery Management System system. Typically no immediate action is required.