BMS-F166
BMS_f166_SW_AhToBeCharged_Imbal
Also written as BMS_F166 / BMS F166 / BMS_f166_SW_AhToBeCharged_Imbal / bms_f166_sw_ahtobecharged_imbal
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-F166 mean?
Tesla fault code in the Battery Management System (BMS) module. The Battery Management System (BMS) has detected that the delta between the brick that needs the least amp hours (Ah) compared to the one that needs the most is greater than 15Ah.
Original Description
The Battery Management System (BMS) has detected that the delta between the brick that needs the least amp hours (Ah) compared to the one that needs the most is greater than 15Ah.
Affected Tesla Models
What You May Notice
- Red warning light on dashboard: The Battery Management System (BMS) has detected that the delta between the brick that needs the least amp hours (Ah) co
- 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: "The Battery Management System (BMS) has detected that the de"
- 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-F166 is classified as a Fault, indicating a critical issue in the Battery Management System system. Do not continue driving and contact Tesla Service immediately.