The AFC North side's only touchdown in the pre-season clash came from an Adrian Robinson fumble recovery in the end zone.
After the game, the head coach told the team's official website: "Obviously, it was not an acceptable performance on a lot of levels. There were some really good efforts, some positives, some negatives. Obviously, a lot to look at and learn from.
"I do think we did some good things, particularly early on in the run game, winning the line of scrimmage and running the ball consistently and efficiently. But just too many mistakes, penalties getting us behind the chains offensively.
"We will take a look at it. We had some young guys, maybe in some instances, being overly aggressive, trying to impress and, obviously, it working against us. We'll learn from this and move forward and, obviously, it needs to improve and put together a winning performance next week."
The Steelers face the Washington Redskins in their next pre-season fixture.