Conditions for Setting the DTC: P0729
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.
This DTC sets during steady state operation when the calculated sixth gear ratio differs from the known sixth gear ratio for more than 2 seconds.