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Every time you start the engine the overdrive is on by default. You have to push the overdrive button to disable it. It should pop up an "OD OFF" message or symbol on the dash when you push the button. If the OD OFF indicator is not present, then the vehicle has overdrive active. If overdrive was turned off, then you would notice the engine revving a little higher than normal at freeway speeds (above 55 MPH).
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