FC family
FC_w167_CA_isoVoltageLow
Unable to DC Fast Charge
What does the FC_w167_CA_isoVoltageLow alert mean?
The vehicle is unable to CHAdeMO DC fast charge (FC) because the FC electric control unit (ECU) detects low isolation.
What you'll see in your Tesla
- Unable to DC Fast Charge
- Contact charging station operator
What triggers it
The FC ECU detects isolation below the alert threshold while CHAdeMO fast charging.
When it clears
The FC ECU detects isolation within the expected bounds.
Potential impact
DC fast charging is unavailable.
Affected models
Model S 2012-2020
Model X 2015-2020
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.