I have a 2014 Cruze Diesel with 64,000 miles. Recently I heard the faint sound of a siren causing me to check the mirror to see if I needed to pull off the road. No emergency vehicle was visible, but on other occasions I again heard the siren(s). Living in a small community we are not accustomed to a lot of emergency events so I finally tumbled to the realization that the sound was coming from my car. The noise happened even when I was idling, and correlated with the speed of the engine. I took it to the dealer who on the first visit did not detect the sound, but on the most recent visit (with me in the car also) he was able to hear the sound which he thought was only evident upon deceleration. He might be right, but it is possible that engine noise obscures the sound during acceleration. After checking under the hood he determined the sound was coming from the turbo charger area but the diagnostic instructions say to compare the sound to a like vehicle. Of course, there are no other Cruze diesels on the lot to compare to. So he took no action and I'm going to monitor the sound. I've received good service from this dealership on my cars and from this technician on my Cruze diesel. However, I'm not the kind of person that is comfortable knowing a part is possibly deteriorating and waiting for (the part) to choose the most inconvenient and expensive time and place to fail, leaving me on the side of a cold and snowy road. It occurred to me that gasoline engine Cruze models may have the same or similar turbo's and other owners may have noticed the siren sound (he describes it as a "whistle"). If so, is this sound not worth worrying about or is there a somewhat predicable timeline or mileage progression resulting in a failed turbo. The service writer thought that a failed turbo would just set a code and result in the car having no power. However, it seems to me that any problem related to emissions on the Cruze diesel results in the dreaded countdown to speed limitations. Please, don't anybody tell me that the turbo's are in short supply and usually on backorder.:dazed002: