STO family
STO_a029_predriverSpiCommSec
Not Available
What does the STO_a029_predriverSpiCommSec alert mean?
Steering Torque Overlay (STO) assist halted due to Secondary pre-driver SPI communication startup error.
What you'll see in your Tesla
- Not Available
What triggers it
Secondary Internal: pre-driver SPI communication three or more times on startup
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.