Conditions for Setting the DTC: P0053
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 PCM detects that the HO2S heater calculated resistance is not between 9.3-3.1 ohms at engine start-up for 1 second.