EPASTP family
EPASTP_a168_c1csInvalidC1App
Not Available
What does the EPASTP_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+
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.