DI family
DI_a020_systemHvilNotClosed
Not Available
What does the DI_a020_systemHvilNotClosed alert mean?
The drive interface (DI) electronic control unit (ECU) detects that the high voltage interlock loop (HVIL) is not closed.
What you'll see in your Tesla
- Not Available
What triggers it
Any DI unit reports the HVIL status as missing or not closed.
When it clears
All DI units report that the HVIL status is closed.
Potential impact
Contactors may not close.
Affected models
Cybertruck
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y 2025+
Semitruck
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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.