CP family
CP_a004_proximityRationality
Charging equipment not recognized
What does the CP_a004_proximityRationality alert mean?
The charge port (CP) electronic control unit (ECU) detects proximity voltage in an unexpected range.
What you'll see in your Tesla
- Charging equipment not recognized
- Try again or try different equipment
What triggers it
The CP ECU detects that proximity voltage is outside of the expected range.
When it clears
The CP ECU detects that proximity voltage enters the expected range.
Potential impact
If the issue is with the vehicle, it will not be able to charge.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
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.