UMC family
UMC_a022_criticalRAM
Not Available
What does the UMC_a022_criticalRAM alert mean?
UMC microcontroller RAM failed self test
What you'll see in your Tesla
- Not Available
What triggers it
UMC microcontroller fails RAM self test
When it clears
UMC microcontroller passes RAM self test
Potential impact
UMC will not operate until internal RAM self test passes
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.