It is the ECM.....u have to use your prom out of the one in the truck
changed it with a new ecm and a new prom and still the same gm had to send me a new trans some thing went wrong in it put new one in truck shifts like you dont even feel it but feels like it goes in to od a little early but i put the old ecm and prom back in it and run the same so i used the new since i paid for it .i did scan it out with the new and no codes .
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