ISM check engine light
Have a 500 HP 2010 ISM. Got a check engine light a couple times while using the engine brake. Cummins read the codes and discovered that there were 23 instances of low oil pressure, starting as long ago as 100 engine hours. Have over 500 engine hours now. Lowest pressure was 28 PSI. Now for the good news. Cummins did research and found that the ECM had to be reprogrammed because essentially the codes were being registered erroneously---that 28 PSI was not in fact "low".
Joel, Lynette and the pups, Czarina & Natasha
2011 Essex 4556