Conditions for Running the DTCs

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The engine speed is less than 6,000 RPM.
The ignition 1 voltage signal is between 9-18 volts.
DTCs P0351, P0352, P0353, P0354 run continuously when the above conditions are met.