2004 Yukon Transmission Trouble

PaulMyers

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I have a 2004 Yukon with a transmission that is driving me crazy. When I first start the truck I get an engine trouble light and the transmission will only operate in 2nd and 3rd gear. I can clear the code and have all four gears and then trouble light comes back again with just 2nd and 3rd gear working. After about 3 miles I can clear the code and it will stay cleared and trans will operate fine. After the truck is parked for an extended period of time (usually overnight) the transmission starts acting up all over again.

Any clues as to what is happening and how I can fix this?

Paul
 
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