UMC family
UMC_a008_wallPlugOT
Unable to charge - Wall plug temperature high
What does the UMC_a008_wallPlugOT alert mean?
UMC wall plug (smart adapter) exceeded temperature threshold
What you'll see in your Tesla
- Unable to charge - Wall plug temperature high
- Wall outlet and wiring inspection recommended
What triggers it
UMC smart adapter temperature exceeded 75 C or the smart adapter specific rating if present
When it clears
UMC smart adapter temperature has fallen below 73 C or the smart adapter specific rating if present
Potential impact
UMC will not allow charging until the smart adapter temperature has fallen 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.