I have just owned this 05 silverado 2500 for a few weeks. I thaught that there was a noise coming from the motor when I accelerated hard but after taking the family on a three day vacation and everybody wanting to hear thier cd's on the stereo (factory unit Bose 6 cd system) I discovered it was coming from the cd player. First it happened on cd space 4 then we thaught it was the cd itself so we tried it in another slot and the noise was there too. Now it is making noise in all cd slots, a chirping noise like the cd is dragging on something as it spins. A "chip chirp chirp" at a high pitch. But it only happens on acceleration, almost like something comes down and drags on the disk. I've heard that these units are pricey and I like the way the factory unit looks and operates. Has anybody had this happen to them?:rockin