EPASTS family
EPASTS_a042_wdhWdTestFail
Not Available
What does the EPASTS_a042_wdhWdTestFail alert mean?
This alert is reported by the WatchdogHandler_A8140x (WDH) component when the external watchdog of the SBC is not working properly.
What you'll see in your Tesla
- Not Available
What triggers it
EPAS ECU SBC device watchdog is not able to reset the MCU at runtime.
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.