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Where is the PCM processor located on the 2004 Chevrolet Trailblazer 4.2L?

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Where is the PCM processor located on the 2004 Chevrolet Trailblazer 4.2L? I got the codes p0606, p1680, and p0306

Vehicle: 2004 Chevrolet Trailblazer 4.2L

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