The Sky Blues fell to their first defeat in six on Friday night at the Ricoh Arena, against Burton Albion in League One action.
Lucas Akins had put the visitors in front, but they were pegged back after half-time by Tom Bayliss' first goal of 2019.
However, the game turned on its head when Bright Enobakhare was shown a second yellow card and then moments later, Jamie Allen scored the winner for the Brewers.