MyTeslaMate
CC family

CC_f020_3vRailIncorrect

Unable to charge - Wall Connector issue

What does the CC_f020_3vRailIncorrect alert mean?

Microcontroller supply rail is incorrect.

What you'll see in your Tesla

  • Unable to charge - Wall Connector issue
  • Wall Connector needs service

What triggers it

Microcontroller supply voltage is outside of valid range.

When it clears

Microcontroller supply voltage enters valid range.

Potential impact

Wall connector will not operate.

Affected models

Model S 2012-2020 Model X 2015-2020

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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.