The Nittany Lions gave up 283 passing yards and 183 yards on the ground in the loss.
Penn State's second-half comeback bid fell agonizingly short in the game's final minutes.
Wallace was questionable in last week's game against Maryland and Washington has missed the last two weeks due to an injury.
Both Carter and Warren are considered first-round prospects in the upcoming NFL Draft.
For the first time since 2016, it's time to watch the Nittany Lions in the Big Ten Championship.
