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transmission codes on 06 GMC seirra

2006chiavette

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2006chiavette New Member

2006chiavette

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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 speedometer and tach work fine but no going to rule out ignition

2006chiavette New Member

2006chiavette

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Did it again today only had 2nd and 3rd shut off truck in plugged parking switch and plug back in start truck and ran fine all the way home but check engine light is still on any one with ideas

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