24 June, 2025Cummins ISM CM870 (2003-06) Fault Code: 111 PID: S254 SPN: 629 FMI: 12/12 Engine Control Module Critical Internal Failure – Bad Intelligent Device or Component. This fault code can only be caused by an internal ECM problem. Repairs are not possible for the ECM. Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window. Pin on Pinterest Opens in a new window. Back to blog