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p1811 04 impala

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      jake321
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      I’ve been having hard shifting problems and recently got autoenginuity in order to diagnose it. It seems solenoid 1-2 is taking sometimes longer than .65 seconds to engage which is causing the p1811 fault code and in turn is cutting power to the pc solenoid in order to increase line pressure and causing it to shift hard. Is there a way to increase the .65 second limit to say 1 second as the transmission shifts fine when the code hasn’t been set?

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