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New member / first time poster ... I have a CPO 08 Denali XL that's still under warranty, about 40k miles on it. How do you tell when the autoride pump is shot? Mine turns on when I have the slightest load in the back (say, a 75# kid in the third row and some groceries in the cargo area) and it never seems to shut off. It also sounds like the compressor the clown at the boardwalk uses to blow up the balloons for the dart game. Is that the way all of these things sound? I'm thinking no, and the truck's got a bad compressor and / or blown shocks. The rear suspension also is pretty clunky over anything more than a slightly rough road.