If your truck is stock, I would ask the local dealer for help in flashing the ECM. Someitmes, their tools work when other aftermarket tools will not.
2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers