TESLA Fault
BMS-F151
BMS_f151_SW_external_isolation
Also written as BMS_F151 / BMS F151 / BMS_f151_SW_external_isolation / bms_f151_sw_external_isolation
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-F151 mean?
Tesla fault code in the Battery Management System (BMS) module. There is an external isolation issue with the Battery Management System (BMS).
Original Description
There is an external isolation issue with the Battery Management System (BMS).
Affected Tesla Models
Model SModel XModel 3Model YCybertruck
What You May Notice
- Red warning light on dashboard: There is an external isolation issue with the Battery Management System (BMS).
- Vehicle may refuse to drive or charge until the fault is cleared
- Sudden power reduction or shutdown may occur while driving
How to Diagnose and Resolve
- 1 Stop driving immediately and move to a safe location
- 2 Do not attempt to charge the vehicle — active fault: "There is an external isolation issue with the Battery Manage"
- 3 Call Tesla Roadside Assistance (+1-877-798-3752) for a flatbed tow
- 4 At the Service Center, Tesla technicians will inspect the HV battery pack and BMS firmware
Severity Notes
BMS-F151 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 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 →