my 2005 caravan will downshift after driving about an hour pcm maybe? bought a used one and it wont even start the it. has a chip key
Don't even mess with it, that it to someone that has the diagnostic equipment to work on a computer controlled transmission. With the right equipment the tech can actually make the trans shift on demand or make it hold gears and watch the sensors and the readings they are sending to the computer and it's outputs back to the control units.
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