Conditions for Running the DTC

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

DTC P0335, P0336, P0340, P0341, P0641, or P0651 is not set.
The engine is running.
The engine speed is less than 1,200 RPM.
The DTC runs continuously when the above conditions are met.