PCS family
PCS_a088_gridFreqDroopDetected
Vehicle charging with off-grid Powerwall
What does the PCS_a088_gridFreqDroopDetected alert mean?
The Power Conversion System (PCS) electronic control unit (ECU) detects the electrical grid frequency droops below its nominal level, indicating the grid may be experiencing heavy loads.
What you'll see in your Tesla
- Vehicle charging with off-grid Powerwall
- Charging rate adjusted to allow power sharing
What triggers it
The PCS ECU detects the electrical grid frequency droops below its nominal level.
When it clears
AC charging is stopped.
Potential impact
AC charging power will be temporarily limited depending on the droop level to reduce the load on the electrical grid.
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
Track your Tesla's alerts automatically
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.