UMC family
UMC_a015_SA_Connection
Wall plug adapter error - Charge rate reduced
What does the UMC_a015_SA_Connection alert mean?
Timeout while UMC was attempting to communicate with smart adapter
What you'll see in your Tesla
- Wall plug adapter error - Charge rate reduced
- Plug adapter fully into Mobile Connector and retry
What triggers it
UMC was unable to read smart adapter genealogy after several retries
When it clears
UMC succesfully reads data from the smart adapter
Potential impact
UMC will only report 8 A charge current capability until the smart adapter genealogy can be read
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.