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There's an electronic control in the transmission, called a pressure control module, that could be out. Mine does the same thing every now and then, but corrects after a cool-down and restart. If the problem doesn't go away on its own you'll have to have the tranny serviced. A new PCM is about $300 plus labor. I didn't do this myself, so I don't know how hard it is to get to.

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Q: What is wrong if the transmission shifts jerky and makes a humming sound?
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