EPASTS family
EPASTS_a115_mcusscLbistSingleFail
Not Available
What does the EPASTS_a115_mcusscLbistSingleFail alert mean?
This alert is reported by MCUSafetyStartupChecks_TC3x (MCUSSC) component when there is a MCU failure. Logic built-in self-test failed.
What you'll see in your Tesla
- Not Available
What triggers it
EPAS logic built-in self-test failed.
When it clears
EPAS HW failure. EPAS power cycle N times and if persists, the gear needs to be changed.
Potential impact
EPAS reset. If reset more than 3 then 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.