One problem related to water pump has been reported for the 2006 Chrysler 300C. The most recently reported issues are listed below.
I had just made a left hand turn onto an access road going approximately 35mph. I noticed my car was bucking and seemed to sputter. First the oil light came on followed by the engine light along with all the dashboard lights. Once the lights went off, I had lost all power. The steering wheel was very difficult to turn but I managed to turn off onto a side street and get out of traffic. Thankfully I had not yet made it onto the expressway, which by the way was during 5 o'clock rush hour traffic! I sat there for a minute and then tried to restart the car. It started up and was drivable. It still sputtered some on the way home. I am hopeful I can make it back into town and take it to an auto repair shop. My car is a one owner car that my late husband bought for me. I love this car. Although it is beginning to have issues and I don't know how much more money I can keep putting into repairs. I have had to have to replace the water pump on two occasions. The latest one was replaced in April, 2013. I have had the module front control & ignition switch both replaced at the dealership @ 83,918 miles 5/31/2013. I have it scheduled for a tune up and fuel injector tune up ironically tomorrow morning before the stalling issue happened. I have felt the car sputter and buck before and I thought it was due for a tune up. However, now I believe this is all together a separate issue. Hopefully Chrysler will step up to the plate and recall these vehicles to be repaired at no expense to the owner.