Conditions for Running 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.

DTCs P0101, P0102, P0103, P0403, P0405, P0406, P046C are not set.
The engine is running.
The engine coolant temperature (ECT) is greater than 60°C (140°F).
The EGR valve is active.
DTCs P0401 and P0402 run continuously when the above conditions are met.