Two problems related to ignition have been reported for the 2003 Chevrolet Silverado. The most recently reported issues are listed below.
Speedometer gets stuck at a speed and does not come back down until you cycle the ignition enough times to get it to return to 0 mph. It is an ongoing problem, it does not seem to be getting any better.
Have had several occasions that key in ignition will not turn to start vehicle.