PCS family
PCS_a091_chgIntBusRationality
Not Available
What does the PCS_a091_chgIntBusRationality alert mean?
The Power Conversion System (PCS) electronic control unit (ECU) detects irrational intermediate bus voltage behavior.
What you'll see in your Tesla
- Not Available
What triggers it
The PCS ECU detects the intermediate bus voltage ripple peak-to-peak value for the charger phase exceeds the specified threshold.
When it clears
The PCS charger phase is no longer enabled.
Potential impact
The rate of AC charging may be reduced, or AC charging may be unavailable.
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.