Just a fyi, remote start does not work if you have a check engine light on.
I have just turned 1400 miles and my check engine light is on, remote start (likely related) stopped working and On Star can only say they have found a 'fault code' that does not return to a specific issue. I've been struggling with harsh downshifts going down hill. I have read the threat re: hill decent but the transmission takes the revs to uncomfortable heights.
I am very pleased with the truck but not a trip to the dealer this soon. Any thoughts are appreciated. Any recommendations on Seattle-area dealers with experience on the baby Duramax would be welcome as my two local/Seattle GMC/Chevrolet service departments seem unfamiliar with the engine.