BMS-W172
BMS_w172_SW_Drive_Iso_Warning
Also written as BMS_W172 / BMS W172 / BMS_w172_SW_Drive_Iso_Warning / bms_w172_sw_drive_iso_warning
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-W172 mean?
Tesla warning code in the Battery Management System (BMS) module. The addition of a Limp Reaction to Repeated Isolation (f027) alert so the customers could feel a limp response a few drive cycles before the vehicle became Vehicle Off Road (VOR) was requested to allow customers to have ample warning and a noticeable driving symptom before the VOR occurs. The current specification will set a limp when one of the following conditions are met: 2 drive cycles with alert 35 (SW_Isolation). 7 drive cycles with alert 142 (SW_Isolation_Degradatio). 2 drive cycles with alert 028 (SW_Drive_Iso_StdDev).
Original Description
The addition of a Limp Reaction to Repeated Isolation (f027) alert so the customers could feel a limp response a few drive cycles before the vehicle became Vehicle Off Road (VOR) was requested to allow customers to have ample warning and a noticeable driving symptom before the VOR occurs. The current specification will set a limp when one of the following conditions are met: 2 drive cycles with alert 35 (SW_Isolation). 7 drive cycles with alert 142 (SW_Isolation_Degradatio). 2 drive cycles with alert 028 (SW_Drive_Iso_StdDev).
Affected Tesla Models
What You May Notice
- Battery management warning: The addition of a Limp Reaction to Repeated Isolation (f027) alert so the customers could feel a limp response a few dri
- Charging speed may be limited or sessions interrupted early
- Reduced estimated range may appear on the touchscreen
How to Diagnose and Resolve
- 1 Perform a soft reboot: hold both scroll wheels until the screen restarts
- 2 Try a full charge cycle to recalibrate the BMS
- 3 If "The addition of a Limp Reaction to Repeated Isolat" persists after reboot, schedule a Tesla Service appointment
- 4 Avoid DC fast charging until the issue is resolved
Severity Notes
BMS-W172 is a Warning in the Battery Management System system. Schedule service soon. Monitor your vehicle for additional warnings.