BMS-A149
BMS_a149_SW_Missing_Config_Block
Also written as BMS_A149 / BMS A149 / BMS_a149_SW_Missing_Config_Block / bms_a149_sw_missing_config_block
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-A149 mean?
Tesla alert code in the Battery Management System (BMS) module. Incorrect or Missing configuration block programmed The BMS config block may be missing, incorrect, or unsupported Program the supported config block for the given pack configuration The BMS is unable to initialize configuration parameters Internal condition to HV battery requiring limiting max allowed brick voltage
Original Description
Incorrect or Missing configuration block programmed The BMS config block may be missing, incorrect, or unsupported Program the supported config block for the given pack configuration The BMS is unable to initialize configuration parameters Internal condition to HV battery requiring limiting max allowed brick voltage
Affected Tesla Models
What You May Notice
- BMS-A149 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-A149 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.