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Re: p0650 & p0281 I am stumped! 2004 slt z71 4x4 5.3
if you are probing the harness with the cluster out and a1 and b12 have a reading then either the harness has a short in it or the pcm does. i'd say unplug the pcm and then see if you have a reading for ground ohms if you don;t i'd say the pcm is at fault
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