BMS-A155
BMS_a155_SW_Weak_short_impedence
Also written as BMS_A155 / BMS A155 / BMS_a155_SW_Weak_short_impedence / bms_a155_sw_weak_short_impedence
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-A155 mean?
Tesla alert code in the Battery Management System (BMS) module. Indicates a potential weak short impedance was too low in at least one brick BMS sees the charge port MIA -- some messages are MIA
Original Description
Indicates a potential weak short impedance was too low in at least one brick BMS sees the charge port MIA -- some messages are MIA
Affected Tesla Models
What You May Notice
- BMS-A155 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-A155 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.