TESLA Fault

BMS_f123

BMS_f123_SW_Internal_Isolation

System
BMS
Battery Management System
Type
Fault
Category
Battery
Severity
Fault (Critical)

What does BMS_f123 mean?

Tesla fault code in the Battery Management System (BMS) module. This alert points to a high voltage (HV) battery internal isolation breakdown detected. This condition is concerning and should be should be addressed rapidly and thoroughly. Thresholds: BMS_a123 will trip if the isolation is below 500 Ohm/Volt or 192 Kohms at 385V and the contactors are open. The alert will clear if the isolation goes over 1000 ohm/volt and the contactors are open.

Original Description

This alert points to a high voltage (HV) battery internal isolation breakdown detected. This condition is concerning and should be should be addressed rapidly and thoroughly. Thresholds: BMS_a123 will trip if the isolation is below 500 Ohm/Volt or 192 Kohms at 385V and the contactors are open. The alert will clear if the isolation goes over 1000 ohm/volt and the contactors are open.

Severity Notes

BMS_f123 is classified as a Fault, indicating a critical issue in the Battery Management System system. Do not continue driving and contact Tesla Service immediately.

Other BMS Codes

BMS_a001 BMS_a002 The Gateway packPerformanceDeviation config does not match t... BMS_a003 BMS was unable to read a pack birth date from the calibratio... BMS_a004 The pack hot seal test has not completed in the lifetime of ... BMS_a007 Charge rate is limited until cell temperatures increase... BMS_a016 The module IDs do not match the pack type set by the config ... BMS_a017 BMS_a018
View all BMS codes →

Tesla alert codes sourced from the community-maintained Tesla Alerts Dictionary. This information is for educational purposes only. Always consult Tesla Service for official diagnosis and repairs.