BMS-W166
BMS_w166_SW_AhToBeCharged_Imbal
Also written as BMS_W166 / BMS W166 / BMS_w166_SW_AhToBeCharged_Imbal / bms_w166_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-W166 mean?
Tesla warning code in the Battery Management System (BMS) module. This alert is for engineering visibility. It does not mean there is an issue with the pack, and the pack should not be replaced due to the presence of this alert. The alert is reported when the delta between the brick that needs the least amp hours (Ah) compared to the one that needs the most Ah is greater than 15Ah. Alert Set Condition: (maxAhToBeCharged - minAhToBeCharged) > 15Ah ??
Original Description
This alert is for engineering visibility. It does not mean there is an issue with the pack, and the pack should not be replaced due to the presence of this alert. The alert is reported when the delta between the brick that needs the least amp hours (Ah) compared to the one that needs the most Ah is greater than 15Ah. Alert Set Condition: (maxAhToBeCharged - minAhToBeCharged) > 15Ah ??
Affected Tesla Models
What You May Notice
- Battery management warning: This alert is for engineering visibility. It does not mean there is an issue with the pack, and the pack should not be r
- 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 is for engineering visibility. It does " persists after reboot, schedule a Tesla Service appointment
- 4 Avoid DC fast charging until the issue is resolved
Severity Notes
BMS-W166 is a Warning in the Battery Management System system. Schedule service soon. Monitor your vehicle for additional warnings.