EPASTP family
EPASTP_a009_mcusscLbistPermanentFail
Not Available
What does the EPASTP_a009_mcusscLbistPermanentFail alert mean?
This alert is reported by the 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 Microcontroller built-in self tests (BIST) that the SW runs after reset failed for 3 consecutive times.
When it clears
Perform EPAS ECU power cycle.
Potential impact
EPAS full loss of assist.
Affected models
Model Y
Model Y 2025+
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