The Cowboys and Garrett Gilbert threw a scare into the unbeaten Steelers before falling 24-19 at AT&T Stadium.
Gilbert threw a 20-yard TD pass to rookie CeeDee Lamb in the first quarter as Dallas jumped out to a 13-0 lead.
Greg Zuerlein kicked three field goals as the Cowboys took a 19-9 lead into the fourth quarter.
Ben Roethlisberger rallied Pittsburgh with two fourth quarter TD passes.
Gilbert completed 21 of 38 passes for 243 yards with a TD and a pick in his first NFL start.
He is the fourth different starting QB in five games for the ‘Pokes. Dallas fell to 2-and-7.