Hopefully they dont charge you up the ass for them to check for a SES light. It is just proboly a maf needs to be cleaned. You should take it to a NAPA or Auto zone and ask them if you can do a OBD II diagnositc test. It will just give you a code like P0303 or something. Just get on here and tell us and we can look it up. I have access to GM's Service Information and I can look up codes that away. I have heard of people just googling the number and get the completly wrong thing. My friend had a camaro with a check engine light on and he decided to google the number and they had said it was a EVAP problem but i looked it up through SI andi had found out it was a misfire problem and we got it fixed and drove it and the light went away.