Service engine light - powertrain intake - a little help?

2001 GMC Jimmy V6 Vortec

Service engine light comes on - Onstar runs real-time diagnostics and reports a powertrain intake message of some sort (my wife thinks she said powertrain intake reduced). Anyway, anybody have an idea what this could be? I changed the air filter about 2 months ago, but that is it. I really don't want to pay a mechanic to tell me it is something simple came loose or something like that.

Thanks,
Jeff

Go to autozone and get your codes scanned.