One problem related to suspension noise has been reported for the 2009 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Impala based on all problems reported for the 2009 Impala.
Since about a year after I owned this car I have been having tire wear problems and noises coming from the front end. I took it while still under warranty to the dealership only to be told it was the brakes sticking and this was normal for these brakes on this model. So I let it go only to get worse so I took it to my mechanic and he says both control arms are loose a the bushings are bad and have to be repalced. I see that there was a recall on this model of police cars I think you may need to look at expanding this. I also only have 38300 miles on this car and have never had to replace suspension parts on a car this early.