UI family
UI_a184_ISAFaulted
Intelligent Speed Assist unavailable
What does the UI_a184_ISAFaulted alert mean?
Intelligent Speed Assist (ISA) feature is not operating as expected.
What you'll see in your Tesla
- Intelligent Speed Assist unavailable
- Not Available
What triggers it
ISA feature is enabled in the vehicle's region and experienced a condition affecting its operation. Investigate any alerts from the Autopilot (AP) system for possible causes.
When it clears
ISA feature receives required inputs and functionality returns.
Potential impact
ISA active safety feature is unavailable.
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
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.