BMS family
BMS_a109_HW_BMB_Mute_Status_Mismatch
Not Available
What does the BMS_a109_HW_BMB_Mute_Status_Mismatch alert mean?
A battery monitoring board (BMB) device has a mute status that does not align with the mute or unmute command sent by the battery management system (BMS).
What you'll see in your Tesla
- Not Available
What triggers it
Mute is disabled for any device while balancing, or otherwise enabled for any device.
When it clears
Mute is enabled for all devices while balancing, or otherwise disabled for all devices.
Potential impact
Bleeding bricks that do not mute during balancing can impact the state of charge (SOC) estimation.
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.