APP family
APP_w154_vcleftMiaPartyBus
Not Available
What does the APP_w154_vcleftMiaPartyBus alert mean?
One or more of the messages the Autopilot electronic control unit (ECU) receives periodically from the left vehicle controller (VCLEFT) is not received on the Party bus, indicating the VCLEFT may be unavailable (MIA).
What you'll see in your Tesla
- Not Available
What triggers it
One or more of the expected messages from the VCLEFT is not received on the Party bus.
When it clears
The Autopilot ECU starts receiving expected messages from the VCLEFT on the Party bus.
Potential impact
Autopilot features may be unavailable, or may not function as expected.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
Semitruck
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.