PCS family
PCS_a093_powerRailRationality
Not Available
What does the PCS_a093_powerRailRationality alert mean?
PCS detects one of its logical power rail's measurement becomes irrational
What you'll see in your Tesla
- Not Available
What triggers it
Power conversion system detects that a logical power rail voltage is outside expected range for more than one second
When it clears
Power conversion system detects that all logical power rail voltages are within expected range for more than one second
Potential impact
Inability to precharge HV bus, inability to support 12V system, inability to AC charge, 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.