The intake air temperature signal is too high on the circuit, which reads as very cold air. The driver may notice little beyond the engine light.
Likely causes, most common first
- Disconnected or open sensor
- Open wiring
- Corroded connector
- Faulty IAT sensor
Parts usually involved
- IAT sensor
- Sensor connector
Test before you replace
Check the live IAT reading, then test the connector, wiring and sensor resistance.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.