2002 gmc sierra 2500hd showing code P0332 from my scanner

Hi I just bought a used 2002 Sierra 2500hd crew cab 4x4. A few days after I bought it the check engine light came on. I bought a obdii
scanner on ebay and found it shows P0332. I reset the computer but a few days later the check engine light came back and again showing code P0332. In the book it say knock sensor 2 Low voltage. What is most likely the problem? How to diagnose further?
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