Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0068, P0120, P0220, P2135 are not set.
The engine is running.
The minimum engine run time of 10-242 seconds is met, depending on the start-up engine coolant temperature (ECT).
The accelerator pedal angle is less than 1 percent when the engine speed is less than 1,200 RPM.
OR
The throttle angle is less than 20 percent when the engine speed is more than 1,200 RPM.
DTC P0108 runs continuously when the above conditions are met.