UMC family
UMC_a018_vehConnOTFoldback
Charge rate reduced - Handle temperature high
What does the UMC_a018_vehConnOTFoldback alert mean?
UMC vehicle connector (charge handle) temperature is causing output current reduction
What you'll see in your Tesla
- Charge rate reduced - Handle temperature high
- Check charge handle or charge port for debris
What triggers it
UMC vehicle connecter temperature has exceeded 65 C
When it clears
UMC vehicle connector temperature has fallen below 63 C
Potential impact
UMC will reduce reported current capability by half until the vehicle connecter cools sufficiently
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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.