HVP family
HVP_w039_PackContactorFellOpen
Not Available
What does the HVP_w039_PackContactorFellOpen alert mean?
The High Voltage Processor (HVP) has detected a pack contactor has opened during a closed state.
What you'll see in your Tesla
- Not Available
What triggers it
The HVP has detected a voltage drop across the contactor and low contactor coil current, indicating a pack contactor has opened despite being in a closed state.
When it clears
The HVP detects the pack contactor state as open.
Potential impact
The pack contactor state will appear as open. The vehicle powertrain may unexpectedly lose high voltage power under load.
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.