2002 Chevy Suburban Service Engine code Catalytic Converter

Service Engine light came on about a week ago - just had code checked - guy said it is the cc - I mentioned that I also noticed (when I start up) the airbag light comes on then goes off. Scared me - was assured that the engine was just running it's own test and that it is only the cc. I am under emissions warranty for cc so I just came back from a Chevy Dealer. He says that the airbag light is a totally separate system and that there must be something wrong with the airbag system.I called the guys that did my code (for free - Chevy dealer wanted 75.00 just to code it) and they told me that it's only the cc - do not do anything else. What do you guys think - I don't want to get ripped off. Thanks for your input.