GMC W Series owners have reported a total of 21 problems for their cars built in the 9 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the GMC W Series. The 2007 GMC W Series cars have the most problems reported (6 problems).
The following chart shows the 10 most common problems for GMC W Series cars. The number one most common problem is related to the vehicle's service brakes, hydraulic (6 problems). The second most common problem is related to the vehicle's fuel system, other (3 problems).