BMS-W171
BMS_w171_SW_Pack_Motor_Mismatch
Also written as BMS_W171 / BMS W171 / BMS_w171_SW_Pack_Motor_Mismatch / bms_w171_sw_pack_motor_mismatch
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-W171 mean?
Tesla warning code in the Battery Management System (BMS) module. After installing a re-manufactured or new high voltage (HV) battery and performing the replacement routine, the Battery Management System (BMS) triggers this alert, which is hidden. The log data reads, "Pack does not support Permanent Magnet motor." The vehicle is still is able to drive with no customer-facing alerts.
Original Description
After installing a re-manufactured or new high voltage (HV) battery and performing the replacement routine, the Battery Management System (BMS) triggers this alert, which is hidden. The log data reads, "Pack does not support Permanent Magnet motor." The vehicle is still is able to drive with no customer-facing alerts.
Affected Tesla Models
What You May Notice
- Battery management warning: After installing a re-manufactured or new high voltage (HV) battery and performing the replacement routine, the Battery
- 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 "After installing a re-manufactured or new high vol" persists after reboot, schedule a Tesla Service appointment
- 4 Avoid DC fast charging until the issue is resolved
Severity Notes
BMS-W171 is a Warning in the Battery Management System system. Schedule service soon. Monitor your vehicle for additional warnings.