2003 rav 4 automatic trans

trans bangs into reverse,feels like it starts in secound gear then drops to first and shifts up sharp.It is due for change via schedule… how ever is there something more going on here.? If I change the fluid and filter is should I add conditioner?

Scan the computer for codes before you do anything. Most local auto parts stores will do this for free. If there are any trouble codes, write them down and post back with us and we’ll go from there.