2002 GMC SIERRA DENALI Electrical System Problems

I PURCHASED A 2002 GMC SIERRA DENALI IN SEPT 2002 NEW FROM A LOCAL DEALER. I AM THE PRIMARY DRIVER AND DO NOT ABUSE THE VEHICLE. I KEEP ALL THE SERVICE WORK UP ON IT THRU THE SELLING DEALER. THE PROBLEM THAT I HAVE IS THAT THE QUDARSTEER CONTROL MODULE WENT OUT AND I CALLED GM FOR A SERVICE REQUEST. GM SET UP AN APPOINTMENT FOR ME WITH THE SELLING DEALER TO CHECK OUT THE PROBLEM. THE DEALERSHIP CHECKED OUT MY TRUCK AND TOLD ME THAT THE QUDRASTEER MODULE WAS BAD AND NEEDED REPLACED. THEY GOT ON THEIRE COMPUTER AND TRIED TO LOCATE A STEERING MODULE. BELIVE IT OR NOT THERE ISN'T ONE IN THE UNITED STATES. GM DOSEN'T MAKE THEM ANYMORE THEY HAVE BEEN DISCONTUINED. GM PRODUCED THIS TRUCK UNTILL 2005, I WAS UNDER THE IMPRESSION THAT THEY HAD TO SUPPLY PARTS FOR VEHICLES THAT THEY MADE FOR AT...