K20 Engine Control Module: Programming and Setup (Gasoline Engines): Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 GMC Sierra 3500 HD, 2013 GMC Sierra 2500 HD, 2013 GMC Sierra 1500, 2013 Chevrolet Silverado 3500 HD, and 2013 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The following service procedures require either a programming or a setup event performed for a complete repair.
NOTE:
Record the engine oil and transmission fluid life remaining percentages before proceeding with any programming procedures.