Chevrolet HHR problems by year
4,753 complaints across 6 model years, 2006–2011. 2006 draws the most at 1,367; 2011 the fewest at 288.
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.