STO family
STO_a002_pwrSupFail
Not Available
What does the STO_a002_pwrSupFail alert mean?
Steering Torque Overlay (STO) assist halted due to Power Supply IC failure.
What you'll see in your Tesla
- Not Available
What triggers it
Power Supply Integrated Circuit (IC) failure flag set for 5ms
When it clears
System Reset
Potential impact
Steering Assist reduced
Affected models
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.