FC family
FC_a131_CA_flyback_HW_OV
Unable to DC Fast Charge
What does the FC_a131_CA_flyback_HW_OV alert mean?
The vehicle is unable to begin CHAdeMO DC fast charging because the fast charge (FC) electronic control unit (ECU) detects a hardware overvoltage event during flyback.
What you'll see in your Tesla
- Unable to DC Fast Charge
- Contact charging station operator
What triggers it
The FC ECU detects that the flyback voltage is over the alert threshold.
When it clears
The FC ECU detects that the flyback voltage is within expected bounds.
Potential impact
DC fast charging is unavailable.
Affected models
Cybertruck
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.