Chevrolet Cobalt problems by year
10,106 complaints across 6 model years, 2005–2010. 2006 draws the most at 3,056; 2010 the fewest at 795.
Read this first
Complaint volume tracks how many cars were sold as much as how reliable they were. A popular model year will always look worse than a rare one. Compare the dominant failure system between years rather than the raw totals.