Tesla BMS_w017 — Cell Voltage Imbalance

Battery Management (BMS) alert — plain English explanation and what to do next

System

Battery Management (BMS)

Severity

Medium Severity

Dealer visit

Schedule soon

Affects models

Model S, X, 3

What BMS_w017 means

BMS_w017 means individual cells in your Tesla battery pack are showing different voltage levels. This can indicate early battery degradation. Try a full charge cycle first. If range is declining schedule service.

What to do

✓ Good news: Often resolves with a full charge cycle. Monitor your range over the next few weeks.

Perform a full charge cycle — Charge to 100% then drive to 15%. This helps the BMS recalibrate cell readings.

Monitor range consistency — Check if estimated range at full charge matches expected range for your model.

Schedule service if persistent — If BMS_w017 keeps appearing book a Tesla service appointment for battery diagnostic.

Related Tesla error codes

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