what causes the check engine light to stay on on 2006 Chevrolet Tahoe

I called onstar and they ran a diagonistic and said service the fuel system is that like changing out fuel filter or is it more

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1 answer
did they tell you the exact code?and yes there i'd say there is more to it than just changing fuel filter. they were probably just referring that it was a code flagging a fuel system malfunction.