2 Cummins ECM codes (calibration codes) for QSV81-G2 natural gas genset (D663002GX03) (CM2180), from the Cummins ECM code cross-reference sheets: each code with its fuel rating (FR), software (SC) and data (DO) options. 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.