I have an '08 CTS, 41,000 miles and engine light came on. All my gauges are good, as far as the temperature, oil, RPM, etc. Can anyone tell me if this maybe just a general maintenace alert? I've never had it come on before and the car seems to be running well. I recently lost my job and cannot run it into the garage, especially if it's just a general maintenance light. I am bothered by the fact that it's never come on before. Your help appreciated and I apologize if I did not post in proper forum.