BMS-A055
BMS_a055_SW_HvChain_Model_Fault
Also written as BMS_A055 / BMS A055 / BMS_a055_SW_HvChain_Model_Fault / bms_a055_sw_hvchain_model_fault
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-A055 mean?
Tesla alert code in the Battery Management System (BMS) module. Alert for indicating that the HV chain model has faulted and leaky bucket is being used. A bleed FET on Batman has failed.
Original Description
Alert for indicating that the HV chain model has faulted and leaky bucket is being used. A bleed FET on Batman has failed.
Affected Tesla Models
What You May Notice
- BMS-A055 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-A055 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.