Conditions for Running the DTC: P0721
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0716, P0717, or P0722 are not active.
- A shift is complete and range attained is not neutral.
- The engine speed is between 200-7500 RPM.