TL*THE CONTACT OWNS A 2005 CHEVROLET SILVERADO 1500. WHILE DRIVING 45 MPH, THE SPEEDOMETER STOPPED WORKING PROPERLY. THE CONTACT CRASHED THE VEHICLE INTO A DITCH. THE DEALER HAS NOT DIAGNOSED THE VEHICLE. THERE WERE NO WARNINGS PRIOR TO THE FAILURE. THE CURRENT AND FAILURE MILEAGES WERE 54,000.