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2006 GMC Sierra sle 1500 5.3 z71 extended cab tranny codes


2006chiavette

Question

I have c0201/ p0740/ p0753/ p0758/ p0785/ p2761 codes and twice it has started out in a higher gear. Checked plugs on tranny they looked good service engine light was on until I cleaned the plug on the driver side and test drove it after it shifted in to high gear the light went out. Any ideas my sleep and tach work fine but no going to rule out ignition

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