NHTSA Complaint #10440123 — 2003 GMC YUKON DENALI

I HAVE HAD MULTIPLE ONGOING ELECTRICAL ISSUES WITH THIS VEHICLE. STARTING IN 2005, THE EXTERIOR ELECTRONICS (I.E. SIGNAL LIGHTS, STOP LIGHTS, HEAD LIGHTS, ETC) BEGAN TO MALFUNCTION. FOR EXAMPLE, I WOULD TRIGGER THE SIGNAL FOR ONE DIRECTION AND ALL OF THE SIGNALS FOR ALL DIRECTIONS WOULD TRIGGER... EVEN PRESSING THE BRAKES TRIGGERED ALL OF THE EXTERIOR SIGNALS. THE DEALER HAD A HARD TIME ISOLATING MY PROBLEM, BUT AFTER SEVERAL VISITS, THE DEALER WAS FINALLY ABLE TO DIAGNOSE AND RECTIFY IT... THEY ISOLATED IT TO A JUNCTION BOX WHERE ALL OF THE ELECTRONICS TERMINATE. HOWEVER, BY THIS TIME, MY VEHICLE WAS OUT OF WARRANTY, SO I HAD TO COVER THE COSTS FOR REPAIRING THE PROBLEM MYSELF. MY MOST RECENT ISSUES, WHICH, BY THE WAY, SEEM TO BE COMMON ISSUES, ARE TRIGGERED BY A MESSAGE STATING, "REDUCED ENGINE POWER". THIS PARTICULAR ISSUE DOES NOT ALWAYS RENDER THE SAME RESULTS... SOMETIMES THE VEHICLE'S SPEED WILL SIGNIFICANTLY DECREASE TO NEARLY A HALT, BUT OTHER TIMES I MAY JUST EXPERIENCE INCREASED IDLING OF THE ENGINE, EVEN IF I AM AT A COMPLETE STOP. MY UNDERSTANDING, ACCORDING TO HUNDREDS OF REPORTS THAT I HAVE READ ON THE MESSAGE BOARDS, IS THAT THIS ISSUE IS CAUSED BY EITHER A WIRING HARNESS THAT LEADS FROM THE ACCELERATOR TO THE THROTTLE BODY OR IT'S A DEFECTIVE THROTTLE BODY ALTOGETHER. I HAVE EXPERIENCED INTERMITTENT ELECTRICAL PROBLEMS WITH MY WINDOWS AS WELL, BUT THIS APPEARS TO BE A MINOR ISSUE WHEN COMPARED TO THE OTHER TWO THAT I ADDRESSED ABOVE. I WILL FILE A FORMAL COMPLAINT WITH GMC CORPORATE OFFICE TODAY AND SEE WHERE THAT GOES. *TR