VCFRONT family
VCFRONT_a459_thermalFillAndDrive
Thermal system fill / drain detected while in drive
What does the VCFRONT_a459_thermalFillAndDrive alert mean?
The vehicle controller detects that the Thermal Fill Drain service routine is being run while the vehicle is in Drive.
What you'll see in your Tesla
- Thermal system fill / drain detected while in drive
- Powertrain / HVAC performance may be limited
What triggers it
The Thermal Fill Drain service routine is run.
When it clears
The Thermal Fill Drain service routine is stopped.
Potential impact
Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
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.