BMS-A157
BMS_a157_SW_Hist_Update_Missed
Also written as BMS_A157 / BMS A157 / BMS_a157_SW_Hist_Update_Missed / bms_a157_sw_hist_update_missed
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-A157 mean?
Tesla alert code in the Battery Management System (BMS) module. A new histogram missed an update or the max updates missed by a histogram increased above the previous max limit HV battery current exceeded the maximum limit
Original Description
A new histogram missed an update or the max updates missed by a histogram increased above the previous max limit HV battery current exceeded the maximum limit
Affected Tesla Models
What You May Notice
- BMS-A157 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-A157 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.