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No, just when you check the fluid level.

That is a DEFINITE YES. Of course, certain manufacturers have you warm up the transmission before checking.

Others need to be running but in Neutral. Others need to be warmed up to operating temperature, then the gear shift placed in each gear from park to LOW 1, then back to park. Only then can the trans fluid be checked.

Most owner's manuals have the correct procedure.

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Q: Should the car be on when you change the transmission fluid?
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