2004 GMC Sierra 1500

I HAVE A 2004 GMC SIERRA THAT HAS A MALFUNCTIONING SPEEDOMETER. IT SHOWS READING ANYWHERE FROM 0-100 MPH OVER WHAT YOU ARE TRAVELING AT. WITH THE TRUCK TURENED OFF - THE SPEEDOMETER WILL SHOW IT AT SPEEDS OF UP TO 100 MPH. THIS ALL STARTED AT ABOUT THE 40,000 MILE MARK. WE PREVIOUSLY HAD A 2004 CHEVY 5500 TRUCK THAT TOO BEGAN W/ SPEEDOMETER TROUBLE AT THE 40,000 MILE RANGE. WE KNOW SEVERAL OTHER PEOPLE WITH A 2004 CHEVY/GMC ALL OF WHOM HAVE THIS SAME PROBLEM. CHECKING AROUND THE INTERNET AND IT APPEARS THAT THIS IS A HUGE PROBLEM THAT SHOULD WARRANT A RECALL BEFORE SOMETHING TRAGIC COULD HAPPEN.

I HAVE A 2004 GMC SIERRA. FOR THE LAST 3 MONTHS THE SPEEDOMETER HAS BEEN ACTING FUNNY. AT TIMES IT WILL SAY I AM DRIVING A LOT SLOWER THAN I ACTUALLY WAS. FOR EXAMPLE, THIS MORNING, IT SAID I WAS GOING 10 MPH AND I WAS PROBABLY GOING ABOUT 30-35 MPH. I TURNED OFF THE VEHICLE AND IT RESET. YESTERDAY WHILE DRIVING ON A TRIP, THE SPEEDOMETER STUCK ON 75 MPH. I DID NOT REALIZE IT UNTIL CARS STARTED PASSING ME ON THE INTERSTATE AND WHEN I CHECKED MY GPS SYSTEM, IT SAID I WAS GOING AROUND 60 MPH. THE SPEEDOMETER IS JUST ALL OVER THE BOARD. SOMETIMES THE SPEED IS CORRECT, SOMETIMES ITS SLOWER AND SOMETIMES ITS FASTER. I BELIEVE THIS IS A REAL SAFETY CONCERN SINCE THE DRIVER DOES NOT KNOW HOW FAST THEY MAYBE REALLY GOING. I HAVE CHECKED ON THE INTERNET AND IT LOOKS LIKE THIS IS A COMMON PROBLEM. *JB

MY 2004 GMC SIERRA WOULD LIGHT ALL FOUR TURN SIGNALS WHEN THE LEFT TURN SIGNAL WAS APPLIED, AS IF THE HAZARD LIGHTS WERE ON. TOOK IT TO DEALER AND THEY SAID THEY HAD NEVER SEEN ANYTHING LIKE IT BEFORE. PAID ALMOST 200 DOLLARS TO GET IT LOOKED AT AND FIXED. AFTER GOING HOME, I SEE THAT OTHER SIERRA USERS HAVE THE SAME PROBLEM. MORE SHOCKING, I SEE THAT GM HAD THE EXACT SAME PROBLEMS WITH SOME ENVOYS, BARBADOS, TRAILBLAZERS, AND OTHERS, AND PERFORMED A SAFETY RECALL AT NO CHARGE. IT IS OUTRAGEOUS THAT ALL VEHICLE OWNERS WITH THESE PROBLEMS WERE NOT NOTIFIED AND THE FAULTY COMPONENTS REPLACED. HAVE BEEN TRYING TO GET IN TOUCH WITH GM ABOUT THIS AND THEY HAVE YET TO SEND ME ANYTHING BUT CARBON-COPY E-MAILS AND RUNAROUNDS. *JB

SPEEDOMETER FAILS TO RESET TO ZERO. WHEN VEHICLE COMES TO A STOP, THE SPEEDOMETER INDICATOR STOPS AT A SPEED ABOVE ZERO (I.E., 30, 40, 50 MPH). WHEN THE VEHICLE RESUMES TRAVELING, THE SPEEDOMETER INDICATOR STARTS INCREMENTING AT THE SPEED AT WHICH IT STOPPED (I.E., 30, 40, 50 MPH). THEREFORE, THE INDICATED SPEED IS MUCH HIGHER THAN THE ACTUAL SPEED. THIS IS NOT ONE INCIDENT, BUT AN ONGOING CONTINUOUS PROBLEM, AND VERY DANGEROUS. *NM