Still in shop. It was a dealer trade and they believe the dealer did not flash the ecm corectly. They can not get the ecm to do anything now. So thier going to change the ecm, do a new install on it and see if that will fix the problem. By the way, if you didnt know, anything plugged into the obd port is now permanently logged into the Ecm memory. The reprogram itself can be returned to stock, but a log is stored showing the techs time and date of ecm changes that were not done by a gm tech computer. This was gm's answer for the diesel owners deleting def systems. Now thier using it on gas trucks too. Tech says it automatically voids warranties now. Learned all this from master tech who was awsome enough to let me see thier equipment