 His first goal of 2011–12 came with the winner in Grimsby's 1–0 away win over Forest Green Rovers on 3 September 2011 after capitalising on a defensive mistake.Coulson was handed a one-match suspension after accumulating five yellow cards, missing the home match against Newport County on 19 November.He made an immediate return to the Grimsby line-up, starting in their 1–0 home win over League Two team Port Vale in the FA Cup first round on 22 November 2011.