VCSEC family
VCSEC_a203_rearEndpointLostComm
Not Available
What does the VCSEC_a203_rearEndpointLostComm alert mean?
The security controller did not receive event for more than 10 seconds from the rear endpoint.
What you'll see in your Tesla
- Not Available
What triggers it
The security does not hear any response when requesting an event from an endpoint for more than 10 seconds.
When it clears
Any response from an endpoint is received.
Potential impact
Phone key will not work.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
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.