From Ford OASIS web site: Oct 30 2013 4252 -C-MAX And Fusion Energi - DTC P2183 Under Investigation Some 2013 C-MAX Energi vehicles built after July 8, 2013, and 2014 Fusion Energi vehicles may exhibit the check engine lamp illuminating accompanied by diagnostic trouble code P2183 in the powertrain control module. If the workshop manual pinpoint tests do not identify any issues, no further diagnostics or repairs should be attempted. This concern is under investigation by engineering and a calibration update is planned to be released to resolve it.