EPASTS family
EPASTS_a168_c1csInvalidC1App
Not Available
What does the EPASTS_a168_c1csInvalidC1App alert mean?
This alert is reported by the Core1CheckerAndStarter_TC3x (C1CS) component when the validation of Core 1 application is failed (CRC check, HSM validation, Entity address check or the Core 1 application was not found).
What you'll see in your Tesla
- Not Available
What triggers it
EPAS MCU Core1 application validation failed (CRC check, HSM validation, Entity address check or the Core 1 application was not found) at startUp.
When it clears
Perform EPAS Software update.
Potential impact
EPAS full loss of assist.
Affected models
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.