UMC family
UMC_a012_pilotFault
Charging equipment communication error
What does the UMC_a012_pilotFault alert mean?
UMC pilot signal is being pulled to an invalid level or pilot generation circuit failure
What you'll see in your Tesla
- Charging equipment communication error
- Try again or try different equipment
What triggers it
Pilot signal transitioned to an invalid voltage level
When it clears
Pilot signal transitions to a valid voltage level
Potential impact
UMC will not allow charging while the pilot signal is invalid
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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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.