For 2013, Koch returned to SR² Motorsports, for which he had driven a limited start-and-park schedule late in 2012, to run most of the season in the team's No.24 and No.00 Toyotas.
For 2013, Koch could not find a full-time ride, and was forced to start-and-park for SR² Motorsports, for which he had driven a limited start-and-park schedule late in 2012. Koch ran most of the season in the team's No.24 and No.00 Toyotas.