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P1596 Speed Control Switch Always High Speed control switch input above maximum acceptable voltage
My truck is throwing this code and P0500 which is rear speed sensor, i'm wondering what is this 1596 talking about as high voltage?
 

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Fault code p1596

My 02 2500 5spd showed that fault code the other day, P1596 (P1596 Speed Control Switch Always High-Speed control switch input above maximum acceptable voltage.) I'm guessing this means there's a short in the cruise control circuit? I engaged the cruise control this morn. without issue this, so what exactly is the deal? How does one troubleshoot this? Thanks in advance for any help offered!
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