Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0121, P0122, P0123, P0221, P0222, P0335, or P0336 are not set.
The engine speed is between 400-6,285 RPM.
The engine coolant temperature (ECT) is greater than -30°C (-22°F).
The fuel level is more than 12 percent.
The ECM is not in fuel shut-off or decel fuel cut-off mode.
DTCs P0300, and P0301-P0304 run continuously when the above conditions are met.