Conditions for Setting the DTC: P1112
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The control module detects that the IAT sensor parameter is more than 130°C (266°F) intermittently for more than 16 seconds.