Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The fuel temperature and the IAT Sensor 1 are more than 100°C (180°F) of each other at start-up.
OR
The fuel temperature and the IAT Sensor 1 are more than 10°C (18°F) of each other at start-up.
AND
The IAT has not dropped more than 2.5°C (4.5°F) after running more than 6 minutes above 24 km/h (15 mph).