Conditions for Setting the DTC: P014A
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 ECM detects that the O2 sensor cannot achieve voltage below 450 mV within 42 grams of accumulated air flow.