The recall covers trucks from the 2016 and 2017 model years.
All have steps and reinforcement brackets in the bumpers that are made of resin.
Toyota says if the truck is backed into something, that could damage the step and it could break if a person steps on it, increasing the risk of injury.
Dealers will replace the resin reinforcement brackets with new ones that are made of steel. Owners will be notified by letter starting in mid-February.