4683 Cummins ECM calibration codes from the Cummins cross-reference sheets, grouped by engine and ECM platform: QSB / QSC / QSL / QSF / QSG / QSX industrial (CM850 Tier 2-3, CM2250 Tier 4i, CM2350 Tier 4F), G-Drive, marine and natural-gas gensets. Type any ECM code into the search box on the home page and it is matched against this table and against the 1273 cal codes read out of our own files. Engine ratings by CPL are on the CPL ratings page.