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P1638 Chevrolet -

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I have a 2001 Chevrolet Silverado with a V-6 and my check engine light came on. I had it checked and one of the code was P1638 Generator F. What is this for on the truck and where is this part located so I can get it fixed. Thank-you.

Vehicle: 2001 Chevrolet Silverado V-6

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