Conditions for Running the DTC (without LY6, L76)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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.