Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
P0112
The IAT sensor is more than 148°C (298°F) for more than 5 seconds.
P0113
The IAT sensor is less than -39°C (-38°F) for more than 5 seconds.