CP family
CP_a044_lostCommsHVP
Unable to charge
What does the CP_a044_lostCommsHVP alert mean?
The charge port (CP) electronic control unit (ECU) loses communication with the high voltage processor (HVP).
What you'll see in your Tesla
- Unable to charge
- Service is required
What triggers it
The CP ECU does not receive all of the expected controller area network (CAN) messages from the HVP.
When it clears
The CP ECU receives all of the expected controller area network (CAN) messages from the HVP.
Potential impact
Charging does not start.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
Semitruck
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.