EPASTP family
EPASTP_a126_mcusscMonbistMiaErr
Not Available
What does the EPASTP_a126_mcusscMonbistMiaErr alert mean?
This alert is reported by MCUSafetyStartupChecks_TC3x (MCUSSC) component when the Secondary Monitor and Standby SMU Built in Self Test failure, MCU failure
What you'll see in your Tesla
- Not Available
What triggers it
EPAS secondary monitor and standby SMU BIST timeout
When it clears
EPAS HW failure. EPAS power cycle N times and if persists, the gear needs to be changed.
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.