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P1639 GMC -

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I have code p1639 on a 2002 Chevrolet 1500 truck. would like to know where to start looking for this short to ground or what sensors will cause this code. the truck starts and runs well at an idle, but stumbles under throttle and shifts erratically.

Vehicle: 2002 Chevrolet siverado 1500 5.3l

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