Major Wright returned an interception 38 yards for a touchdown in the second quarter, and Julius Peppers picked up Ben Roethlisberger's fumble and raced 42 yards for a score in the fourth quarter as the Bears beat the reeling Steelers, 40-23, on Sunday night.
Roethlisberger completed 26 of 41 passes for 406 yards and threw two touchdowns to Antonio Brown, but the Steelers fell to 0-3 for the first time since 1986 thanks to an avalanche of mistakes. Pittsburgh committed five turnovers, four of which led to points by the Bears.
Jay Cutler passed for 159 yards and threw a 17-yard touchdown strike to Earl Bennett with just under six minutes left to give the Bears breathing room after the Steelers trimmed a 21-point deficit to four.
The Steelers trailed by three touchdowns in the first half but pulled to within 27-23 on Shaun Suisham's 44-yard field goal with 10:43 left.
Chicago's offense, which generated little after a 17-point outburst in the first quarter, responded behind Cutler.
The quarterback scrambled for 13 yards on third and 10 to start the drive. Cutler then hit Brandon Marshall for 41 yards on third and 12 to move into Pittsburgh territory. Facing third and five at the Pittsburgh 17, Cutler found Bennett in the back corner of the end zone.
Officials ruled the pass was incomplete, but the play was overturned after replays showed Bennett deftly dragged his right foot before sliding out of bounds.
Pittsburgh tried to get back into the game, but Lance Briggs stripped Roethlisberger of the ball, and Peppers picked it up. The veteran defensive end followed a parade of blockers down the sideline for Chicago's second defensive score of the night and third in two weeks.
The second time Roethlisberger had a pass intercepted came on a late drive and ended up being Pittsburgh's ninth turnover through three games. The Steelers' defense, meanwhile, hasn't recorded a takeaway through 12 quarters.
The mistakes started early. Pittsburgh turned it over twice in the first half. D.J. Williams stripped Roethlisberger in the first quarter, leading to a five-yard touchdown run by Matt Forte.
Chicago was up 17-3 midway through the second quarter when Roethlisberger threw off his back foot in the face of a blitz. The bail sailed into the hands of Wright, who sprinted down the sideline for a touchdown to give the Bears a 21-point lead.
The score marked the second straight week and the 10th time since the start of the 2012 season that the Bears returned an interception for a touchdown, easily the most in the NFL.
The Steelers, looking to avoid their first 0-3 start since Hall of Fame coach Chuck Noll was in the twilight of his career, responded with a 33-yard touchdown pass from Roethlisberger to Brown with 6:35 left in the half to give Pittsburgh hope.
Pittsburgh, which came in ranked 31st in the league in total offense, finally got going. Brown made a one-handed grab in the back of the end zone to get the Steelers to within 27-20. Suisham's field goal pulled them to within four before the Bears put the game away.