CP family
CP_a109_thermistorIrrational
Not Available
What does the CP_a109_thermistorIrrational alert mean?
Thermistor input is open or short circuit
What you'll see in your Tesla
- Not Available
What triggers it
The thermistor reports a voltage less than the open circuit threshold and, if short circuit detection is supported, greater than the short circuit threshold for at least one second.
When it clears
The thermistor reports a voltage greater than the open circuit threshold or, if short circuit detection is supported, less than the short circuit threshold for at least one second.
Potential impact
Charging and heating functions do not work as expected.
Affected models
Cybertruck
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.