BMS-A057
BMS_a057_SW_Bandolier_Model_Warning
Also written as BMS_A057 / BMS A057 / BMS_a057_SW_Bandolier_Model_Warning / bms_a057_sw_bandolier_model_warning
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-A057 mean?
Tesla alert code in the Battery Management System (BMS) module. A temperature estimate from the Bandolier Thermal Model is beginning to diverge from the corresponding thermistor measurement. Early warning alert before the model is reset. A communication issue with the BMB daisy chain is detected No communication issues with the BMB daisy chain have been detected May indicate a loss of BMB sensor data
Original Description
A temperature estimate from the Bandolier Thermal Model is beginning to diverge from the corresponding thermistor measurement. Early warning alert before the model is reset. A communication issue with the BMB daisy chain is detected No communication issues with the BMB daisy chain have been detected May indicate a loss of BMB sensor data
Affected Tesla Models
What You May Notice
- BMS-A057 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-A057 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.