BMS family
BMS_a149_SW_Missing_Config_Block
Vehicle configuration mismatch
What does the BMS_a149_SW_Missing_Config_Block alert mean?
The battery management system (BMS) detects a missing, incorrect, or unsupported config block.
What you'll see in your Tesla
- Vehicle configuration mismatch
- Service is required
What triggers it
The BMS detects that the config block is missing.
When it clears
The BMS detects the correct config block.
Potential impact
The BMS is unable to initialize configuration parameters.
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.