TESLA Alert

BMS-A128

BMS_a128_SW_shunt_MIA

Also written as BMS_A128 / BMS A128 / BMS_a128_SW_shunt_MIA / bms_a128_sw_shunt_mia

System
BMS
Battery Management System
Type
Alert
Category
Battery
Severity
Alert

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-A128 mean?

Tesla alert code in the Battery Management System (BMS) module. Shunt reported as MIA by HVP 6.0.1286.0.55

Original Description

Shunt reported as MIA by HVP 6.0.1286.0.55

Affected Tesla Models

Model SModel XModel 3Model YCybertruck

What You May Notice

  • BMS-A128 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. 1 Reboot the vehicle (hold both scroll wheels for 10 seconds)
  2. 2 Check the Tesla app for any pending software updates
  3. 3 Monitor the alert over 1–2 charge cycles; schedule service if it recurs

Severity Notes

BMS-A128 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.

Other BMS Codes

BMS_a001 BMS_a002 Tesla alert code in the Battery Management System (BMS) modu... BMS_a003 Tesla alert code in the Battery Management System (BMS) modu... BMS_a004 Tesla alert code in the Battery Management System (BMS) modu... BMS_a007 Tesla alert code in the Battery Management System (BMS) modu... BMS_a016 Tesla alert code in the Battery Management System (BMS) modu... BMS_a017 BMS_a018
View all BMS codes →