Conditions for Running the DTC: P0121

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0315, P0335, P0336 are not set.
The engine coolant temperature (ECT) is between 70-125°C (158-257°F).
The engine speed is more than 450 RPM.
The intake air temperature (IAT) is between -7 and +125°C (+19 and +257°F).
DTC P0121 run continuously when the above conditions are met.