my 2005 nissan altima does not go in overdrive, other gears shift ok?
It will probably be your tcm in this car,trainsmission control module,it tell,s the tranny to shift,you may try to undo your positive battery cable for a few minute,s and reset it,but if it doe,s not work ,you may have to see a mechanic to fix your problem,here is a diagram of it,s location in your car,click to up size it.
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