Cummins diagnostic trouble codes list for ISX, ISF 2.8, ISB, ISC, ISLe, 4ISBe, 6ISBe, ISDe, ISM Cummins engines fault codes list. Error code 111. Engine: ISF 2.8, ISF 3.8, isb, qsb, qsc, isl Error: ECM internal failure. Description: This DTC can only occur if there is a problem inside the ECM.
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