UMC family
UMC_a019_inputOTFoldback
Mobile Connector to adapter connection hot
What does the UMC_a019_inputOTFoldback alert mean?
UMC input terminal temperature is causing output current reduction
What you'll see in your Tesla
- Mobile Connector to adapter connection hot
- Maximum charge rate reduced
What triggers it
UMC input terminal temperature has exceeded 85 C
When it clears
UMC input terminal temperature has fallen below 83 C
Potential impact
UMC will reduce reported current capability by half until the input terminals cool sufficiently
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.