TESLA Fault

BMS-F034

BMS_f034_SW_Isolation_Sensor

Also written as BMS_F034 / BMS F034 / BMS_f034_SW_Isolation_Sensor / bms_f034_sw_isolation_sensor

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

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-F034 mean?

Tesla fault code in the Battery Management System (BMS) module. There is a high voltage (HV) battery isolation sensor error detected.

Original Description

There is a high voltage (HV) battery isolation sensor error detected.

Affected Tesla Models

Model SModel XModel 3Model YCybertruck

What You May Notice

  • Warning light on touchscreen related to battery isolation
  • Vehicle may limit charging or driving
  • Possible smell or visual evidence of battery damage (rare)

How to Diagnose and Resolve

  1. 1 Stop driving and park the vehicle
  2. 2 Do not charge — isolation faults can indicate a compromised HV circuit
  3. 3 Reboot: hold brake + scroll wheels for 10 seconds; if alert clears, monitor closely
  4. 4 If alert persists, contact Tesla Service immediately
  5. 5 Technician will use an isolation tester to identify whether the fault is external or internal to the pack

Severity Notes

BMS-F034 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 →