Conditions for Setting the DTC: P0452
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 ECM detects the FTP sensor signal voltage is less than 0.13 volts for 4 seconds or for a cumulative of 50 seconds.