My friends' '09 Caliber has a check engine light on, and I can't seem to find the right combination of tricks to get the light to flash a code for me GM MDI Scan tool. I've read the manual, and the car doesn't seem to follow the sequence as it says it should. The car doesn't act any differently, and I haven't checked the fluid levels just yet, as of now I'm stuck just trying to get the code.