BMS family
BMS_a030_Impedance_Deviation
Not Available
What does the BMS_a030_Impedance_Deviation alert mean?
High impedance was detected on one or more bricks.
What you'll see in your Tesla
- Not Available
What triggers it
Impedance for one or more bricks exceeds the noise threshold for several measurement counts.
When it clears
All bricks have impedance measurements within the noise threshold.
Potential impact
One or more cells in a brick are likely missing, resulting in a high impedance current path. Other potential causes are a high Direct Current Resistance (DCR), intermittent anode laser weld on the given brick(s), or an islanded brick.
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.