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CORRECT!!!! Another superior design by the Vette gang at GM I have the same problem on my 01 Z06 with 20k miles... I get it once a week, and manually clear it from the DIC every time... If I could get my Acura TL to accelerate like my Z06, the Z would be history!!!
This check valve can be removed without removing the intake, but it is a royal pain (according to Edensknight, who has done it). It is a very common failure among C5s. My C5 had this one go after 5 years and 26,000 miles.