Conditions for Running the DTC

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

DTCs P0721 and P0722 are not active.
The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.
Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.
Output speed is greater than 60 RPM.
Transmission fluid temperature (TFT) is between 20-130°C (68-266°F).
The shift is complete and NEUTRAL range is not selected.