Cummins ISL CM850 (2003-06) Fault Code: 343 PID: SID 254 SPN: 629 FMI: 12 Engine Control Module Warning Internal Hardware 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.
For Euro certified engines this fault code indicates that the Real Time Clock feature needs to re reset (if equipped).
Possible repairs:
1)Replace the ECM.
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