EPASTP family
EPASTP_a027_mcusscDmuHfErr
Not Available
What does the EPASTP_a027_mcusscDmuHfErr alert mean?
This alert is reported by MCUSafetyStartupChecks_TC3x (MCUSSC) component when there is a Flash Operation Error OR Command Sequence Error OR Protection Error OR Program Verify Error OR Erase Verify Error OR SRI Bus Address ECC Error OR UCB Original Error
What you'll see in your Tesla
- Not Available
What triggers it
EPAS uC peripheral (DMU_HF) startup checks failure at startup.
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+
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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.