703 problems have been reported for the 2004 Chevrolet Silverado 1500. The following chart shows the 23 most common problems for 2004 Chevrolet Silverado 1500. The number one most common problem is related to the vehicle's service brakes, hydraulic with 236 problems. The second most common problem is related to the vehicle's electrical system (234 problems).
In our research we use the PPMY index to compare the reliability of vehicles. The PPMY index of a certain model is defined as the problems reported per thousand vehicles per Year. The total sales of the 2004 Chevrolet Silverado 1500 in the United States are 483,306 units [1]. If the total number of problems reported by Chevrolet Silverado 1500 owners in the last 21 years is 703, and the age of the vehicle is 21, the PPMY index can then be calculated as
PPMY Index = 703 / 483,306 / 21 * 1000 = 0.07.
For more information, refer to this page: A study of reliability comparison across Chevrolet Silverado 1500 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Chevrolet Silverado 1500 in 2004.
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When making the decision between buying a new or used Chevrolet Silverado 1500, the following table can be used to compare the 2004 Chevrolet Silverado 1500 with the Chevrolet Silverado 1500 from other model years. Note that the number of problems reported for the 2004 Silverado 1500 is 703 while the average number of problems reported for the 30 model years of the Chevrolet Silverado 1500 is 582.