NHTSA Complaint #10628982 — 2004 CHEVROLET SILVERADO

DRIVING THROUGH UTAH AT POSTED SPEED LIMIT OF 75 WITH CRUISE CONTROL ON, THE SPEEDOMETER SUDDENLY STARTED TO INDICATE A DECELERATION FROM CRUISES SPEED TO 30 MPH. MY VEHICLE DID NOT PHYSICALLY SLOW AS EVIDENCED BY MY GPS WHICH CONTINUED TO SHOW ACTUAL SPEED OF 75 MPH. DISENGAGING THE CRUISE CONTROL DID SLOW THE VEHICLE WHEN THE ACTUAL SPEEDS WERE 50+/- MPH THAN INDICATED ON SPEEDOMETER. STOPPING MY VEHICLE AND TURNING THE IGNITION OFF APPARENTLY RESET SOMETHING? IMMEDIATELY RESTARTING MY PICKUP SEEMED TO REMEDY THE PROBLEM FOR A SHORT PERIOD OF TIME. THIS SPEEDOMETER PROBLEM HAS PERSISTED FOR OVER ONE YEAR REQUIRING THE CONTINUAL USE OF GPS TO CONFIRM MY ACTUAL SPEEDS. I HAVE A SIGNIFICANT CAUSE OF CONCERN WHEN INDICATED SPEEDS ARE SIGNIFICANTLY FASTER THAN INDICATED. I CONTACTED GM DEALERSHIP, ONLY TO BE TOLD THEY HAVE NO IDEA OF THE PROBLEM AND WOULD NOT CONFIRM THE CONTINUAL PROBLEM. IN CONJUNCTION WITH THE SPEEDOMETER PROBLEM I'M ALSO EXPERIENCING PROBLEMS WITH THE THE FUEL TANK LEVELS. GAUGES INDICATE 1/2 TANK, HOWEVER WHEN FUELED AT THAT LEVEL THE TANK REQUIRED NEARLY 20 GALLONS OF FUEL TO FULL. AGAIN THE GM DEALERSHIP WAS NOT CONCERNED WITH THE SAFETY PROBLEM. ONLINE SEARCHES OF SIMILAR PROBLEM HAVE INDICATED MANY CHEVROLET SILVERADOS ARE EXPERIENCING SIMILAR SAFETY PROBLEMS. *TR