C-max (built end of July 2013) had annoying low-speed rattle. Especially prominent over minor-bumps at speeds under 30. I took it in for service last Friday. I assumed it was the jounce bumpers, since that is what gets greased up in accord with the TSB 13-12-9 for this symptom.
However they diagnosed the noise using "chassis ears" and determined the front stabilizer links were worn and were the cause. Dealer replaced both front links and bolts.
They also repaired the factory installed engine block heater, which had stopped working earlier this year. Dealer confirmed and fixed by reseating plug at heater. When I asked about how to do this if it recurred, I was told the car needed to be on a lift because access was only from below, reaching up in tight space between rear of engine and firewall - and only when engine was cool.
I also mentioned a third concern: a large jerk when nears full stop while doing down a steep hill if "grade assist" has been used. This is potentially dangerous as it could cause the car to lose traction on a wet, snowy, or icy road and careen out into an intersection. The dealer could do nothing as it is presumably a design / programming problem. Dealer recorded concern and sent on.
In any case, two problems fixed before original warranty expires. I bought the car April 2015 with 27k miles; it has about 34k now. I like it a lot -- more so without continuous rattle.