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I just installed a new used transmission in my 2014 Silverado 1500 and now it acts like it has a dead battery when u try to start it all the power drops out does any body now if the new transmission has to be programmed to my ecm or is there another problem


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Location: Oregon
I don't think the trans programming has anything to do with drawing the battery down on start up. I would look at what the battery is doing on start up and verify that the engine can turn over. Put a ratchet on the crank bolt and make sure the engine can spin normally.


   
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Tcm inside new/used tranny is junk dealer can't communicate with it. there for ecm doesnt know its in park or neutral to start all the power drops out because that's what cars do these days when u hit the key


   
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