BMS-W161
BMS_w161_SW_Contactor_Stress
Also written as BMS_W161 / BMS W161 / BMS_w161_SW_Contactor_Stress / bms_w161_sw_contactor_stress
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-W161 mean?
Tesla warning code in the Battery Management System (BMS) module. This alert points to an excessive contactor stress index, and the data most likely points to worn contactors. The Battery Management System (BMS) does not reduce vehicle performances just with this alert. The intent of the alert is to warn about stress starting to accumulate on at least one contactor.
Original Description
This alert points to an excessive contactor stress index, and the data most likely points to worn contactors. The Battery Management System (BMS) does not reduce vehicle performances just with this alert. The intent of the alert is to warn about stress starting to accumulate on at least one contactor.
Affected Tesla Models
What You May Notice
- Battery management warning: This alert points to an excessive contactor stress index, and the data most likely points to worn contactors. The Batter
- 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 "This alert points to an excessive contactor stress" persists after reboot, schedule a Tesla Service appointment
- 4 Avoid DC fast charging until the issue is resolved
Severity Notes
BMS-W161 is a Warning in the Battery Management System system. Schedule service soon. Monitor your vehicle for additional warnings.