EPASTP family
EPASTP_a047_epmVregVoltFail
Not Available
What does the EPASTP_a047_epmVregVoltFail alert mean?
This alert is reported by the ExternalPowerManager_A8140x (EPM) component when it detects VREG over and under voltage.
What you'll see in your Tesla
- Not Available
What triggers it
EPAS ECU EPM device voltage monitoring failed (VREG over/under-voltage).
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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