PCS family
PCS_a022_bmsMia
Unable to charge
What does the PCS_a022_bmsMia alert mean?
PCS does not receive CAN messages from BMS
What you'll see in your Tesla
- Unable to charge
- Service is required
What triggers it
Charger does not receive all expected CAN messages from battery management system
When it clears
PCS receives all expected CAN messages from battery management system
Potential impact
Inability to AC charge, inability to precharge HV bus, inability to drive
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.