PCS family
PCS_a073_unexpectedAcInputVoltage
External charging equipment error detected
What does the PCS_a073_unexpectedAcInputVoltage alert mean?
AC voltage is present when not expected (indicates a bad charge cable / EVSE)
What you'll see in your Tesla
- External charging equipment error detected
- Try different charging equipment
What triggers it
Charger detects AC input voltage when not requested for more than five seconds
When it clears
Charger does not detect AC input voltage when not requested
Potential impact
Inability to AC charge
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.