EPASTP family
EPASTP_a011_mcusscMonbistErr
Not Available
What does the EPASTP_a011_mcusscMonbistErr alert mean?
This alert is reported by the MCUSafetyStartupChecks_TC3x (MCUSSC) component when there is a MCU internal failure (The Secondary Monitor and Standby SMU Built in Self Test failed).
What you'll see in your Tesla
- Not Available
What triggers it
EPAS microcontroller (MON)BIST failed (SecondaryMonitor versus Standby SMU) at startup.
When it clears
Perform EPAS ECU power cycle.
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.