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Message: [QUOTE="Charles, post: 272264, member: 103"] If you push the button and the truck immediately downshifts, then there is OBVIOUSLY nothing wrong with the trans. The PCM is simply not commanding a downshift otherwise because it doesn't think you want one. This could be low tps voltage, or a speed sensor giving the PCM a high reading, either of which would preclude the PCM from commanding a downshift. When you push the button you are overriding all this and telling the PCM that you want a downshift, no matter the conditions. If it's immidiately doing it, then what else do you expect it to do??? [/QUOTE]

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