2 Cummins ECM codes (calibration codes) for QSB3.3 - CM2150C/D, from the Cummins ECM code cross-reference sheets: each code with its fuel rating (FR), software (SC) and data (DO) options, and the newer code that superseded it where Cummins re-released the rating. An ECM code is what the data plate, INSITE and QuickServe show for the calibration; the matching ECFG is listed under the product id. Send us the code and we will match it to an ECFG.