The other morning. When I walked beside my wife's 06 crossfire. I heard what sounded like a electric ran running. The car had not been driven for around 12 hours. I opened the hood and the sound was coming from under the engine cover. I then started the car and turn it off right away . And what ever was running quit. Then today CEL came on. I retreived code P0410 (secondary air injection pump.) which i quess is what was making the noise the other moring. My question is what would cause this and how would it be getting votage with key off.