APP family
APP_w211_accNoSeatBelt
Cruise control speed reduced
What does the APP_w211_accNoSeatBelt alert mean?
While Traffic-Aware Cruise Control (TACC) is active, the driver unbuckles their seat belt, which causes Autopilot to slow down the vehicle.
What you'll see in your Tesla
- Cruise control speed reduced
- Driver's seat belt is unbuckled
What triggers it
The driver's seat is unbuckled while TACC is active.
When it clears
The driver's seat is buckled.
Potential impact
Autopilot will begin to slow down the vehicle.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2012-2020
Model S 2021+
Model X 2015-2020
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.